JavaWeb-Servlet

1. Web 应用程序简介

2. 编写与设置 Servlet

2.1. 第一个 Servlet 程序

Servlet

@WebServlet("/hello.view")
public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        // 设置响应内容类型器
        response.setContentType("text/html;charset=UTF-8");
        // 取得响应输出对象
        PrintWriter out = response.getWriter();
        // 取得 “请求参数”
        String name = request.getParameter("name");
        out.println("<html>");
        out.println("<head>");
        out.println("<title>HelloServlet</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<p>hello, " + name + "! </p>");
        out.println("</body>");
        out.println("</html>");
        out.close();
    }
}

配置

<web-app>
  <servlet>
    <servlet-name>hello</servlet-name>
    <servlet-class>org.example.java_web.servlet.hello.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>hello</servlet-name>
    <url-pattern>/hello.view</url-pattern>
  </servlet-mapping>
</web-app>

@WebServlet("/hello.view")

访问

/hello.view?name=zhangsan

<p>hello, zhangsan!</p>

2.2. URL 模式设置

requestURI = contextURI + servletURI + pathInfo

out.println("<p>request.getRequestURI(): " + request.getRequestURI() + "</p>");
out.println("<p>request.getContextPath(): " + request.getContextPath() + "</p>");
out.println("<p>request.getServletPath(): " + request.getServletPath() + "</p>");
out.println("<p>request.getPathInfo(): " + request.getPathInfo() + "</p>");

<p>request.getRequestURI(): /JavaWeb_Servlet_war/path.view</p>
<p>request.getContextPath(): /JavaWeb_Servlet_war</p>
<p>request.getServletPath(): /path.view</p>
<p>request.getPathInfo(): null</p>

3. 请求

3.1. 处理请求参数与标头

request.getHeaderNames()

Enumeration<String> names = request.getHeaderNames();
while (names.hasMoreElements()) {
  String name = names.nextElement();
  out.println("<p>" + name + ": " + request.getHeader(name) + "</p>");
}

<p>host: localhost:8080</p>
<p>connection: keep-alive</p>
<p>cache-control: max-age=0</p>
<p>sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Microsoft Edge";v="90"</p>
<p>sec-ch-ua-mobile: ?0</p>
<p>upgrade-insecure-requests: 1</p>
<p>user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36 Edg/90.0.818.46</p>
<p>accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9</p>
<p>sec-fetch-site: none</p>
<p>sec-fetch-mode: navigate</p>
<p>sec-fetch-user: ?1</p>
<p>sec-fetch-dest: document</p>
<p>accept-encoding: gzip, deflate, br</p>
<p>accept-language: zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6</p>

request.getHeader()

out.println("<p>host: " + request.getHeader("host") + "</p>");

request.getHeaders()

Enumeration<String> uas = request.getHeaders("user-agent");
while (uas.hasMoreElements()) {
    String ua = uas.nextElement();
    out.println("<p>user-agent: " + ua + "</p>");
}

3.2. 请求参数编码处理

3.2.1. get 请求

response.setContentType("text/html;charset=UTF-8");

3.2.2. post 请求

request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");

3.3. 读取 Body 内容

private String readBody(HttpServletRequest request) throws IOException {
    BufferedReader reader = request.getReader();
    String input;
    StringBuilder requestBody = new StringBuilder();
    while ((input = reader.readLine()) != null) {
        requestBody.append(input).append("<br>");
    }
    return requestBody.toString();
}

<p>user=%E5%BC%A0%E4%B8%89&password=123456&btn=submit</p>

3.4. 获取上传文件

3.4.1. upload1

form 标签需要设置 enctype="multipart/form-data"

<form action="upload1.do" method="post" enctype="multipart/form-data">
  <div class="form-group">
    <input id="file" type="file" name="filename" value="" />
  </div>
  <button class="btn btn-primary" name="btn" value="upload">上传</button>
</form>

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws IOException {
    // 读取请求的 body
    byte[] body = readBody(request);
    // 取得所有 body 内容的字符串显示
    String textBody = new String(body, StandardCharsets.ISO_8859_1);
    // 取得上传的文件名称
    String fileName = getFileName(textBody);
    // 取得文件开始和结束位置
    Position p = getFilePosition(request, textBody);
    // 输出至文件
    writeTo("d:/" + fileName, body, p);
}

private byte[] readBody(HttpServletRequest request) throws IOException {
    int formDataLength = request.getContentLength();
    // 获取 ServletInputStream 对象
    DataInputStream dataStream = new DataInputStream(request.getInputStream());
    byte[] body = new byte[formDataLength];
    int totalBytes = 0;
    while (totalBytes < formDataLength) {
        int bytes = dataStream.read(body, totalBytes, formDataLength);
        totalBytes += bytes;
    }
    return body;
}

private class Position {
    int begin;
    int end;
    Position(int begin, int end) {
        this.begin = begin;
        this.end = end;
    }
}

private Position getFilePosition(HttpServletRequest request, String textBody) {
    // 取得文件区段边界位置
    String contentType = request.getContentType();
    String boundaryText = contentType.substring(contentType.lastIndexOf("=") + 1);
    // 取得实际上传文件的起始位置和结束位置
    int pos = textBody.indexOf("filename\"");
    pos = textBody.indexOf("\n", pos) + 1;
    pos = textBody.indexOf("\n", pos) + 1;
    pos = textBody.indexOf("\n", pos) + 1;
    int boundaryLoc = textBody.indexOf(boundaryText, pos) - 4;
    int begin = ((textBody.substring(0, pos).getBytes(StandardCharsets.ISO_8859_1)).length);
    int end = ((textBody.substring(0, boundaryLoc).getBytes(StandardCharsets.ISO_8859_1)).length);
    return new Position(begin, end);
}

private String getFileName(String textBody) {
    // 截掉filename前面
    String fileName = textBody.substring(textBody.indexOf("filename=\"") + 10);
    // 截掉 换行符后面的内容
    fileName = fileName.substring(0, fileName.indexOf("\n"));
    // 截掉文件所在目录 和最后一个 "
    fileName = fileName.substring(fileName.lastIndexOf("\\") + 1, fileName.indexOf("\""));
    return fileName;
}

private void writeTo(String fileName, byte[] body, Position p) throws IOException {
    FileOutputStream fos = new FileOutputStream(fileName);
    fos.write(body, p.begin, (p.end - p.begin));
    fos.flush();
    fos.close();
}

3.4.2. upload2

Tomcat 中必须设置 MultipartConfig 标注才能使用 getPart() 相关的 API

@MultipartConfig
@WebServlet("/upload2.do")
public class Upload2Servlet extends HttpServlet {
    // ...
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    request.setCharacterEncoding("UTF-8");
    response.setContentType("text/html;charset=UTF-8");
    // 使用 getPart() 取得 Part 对象
    Part part = request.getPart("filename");
    String fileName = getFilename(part);
    writeTo("d:/" + fileName, part);
}

private String getFilename(Part part) { // 取得上传文件名
    String header = part.getHeader("Content-Disposition");
    return header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));
}

private void writeTo(String fileName, Part part) throws IOException {
    InputStream in = part.getInputStream();
    OutputStream out = new FileOutputStream(fileName);
    byte[] buffer = new byte[1024];
    int length = -1;
    while ((length = in.read(buffer)) != -1) {
        out.write(buffer, 0, length);
    }
    in.close();
    out.close();
}

3.4.3. upload3

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    request.setCharacterEncoding("UTF-8");
    response.setContentType("text/html;charset=UTF-8");
    Part part = request.getPart("filename");
    String fileName = getFilename(part);
    part.write("d:/" + fileName);
}

private String getFilename(Part part) { // 取得上传文件名
    String header = part.getHeader("Content-Disposition");
    return header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));
}

3.4.4. upload4

@MultipartConfig(location = "d:/")
@WebServlet("/upload4.do")
public class Upload4Servlet extends HttpServlet {
    // ...
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    request.setCharacterEncoding("UTF-8");
    response.setContentType("text/html;charset=UTF-8");
    for (Part part : request.getParts()) {
        if (part.getName().startsWith("file")) {
            String fileName = getFilename(part);
            part.write("d:/" + fileName);
        }
    }
}

3.5. 调派请求

3.5.1. include

@WebServlet("/some.view")
public class SomeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println("Some do one ... ");
        RequestDispatcher rd = request.getRequestDispatcher("other.view");
        rd.include(request, response);
        out.println("Some do two ... ");
        out.close();
    }
}

@WebServlet("/other.view")
public class OtherServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println("Other do one ... ");
        // 这里不要关闭 out，否则页面将无法继续写入 some.view 后面的内容
    }
}

3.5.2. forward

public class HelloModel {
    private final Map<String, String> messages = new HashMap<>();
    public HelloModel() {
        messages.put("zhangsan", "hello");
        messages.put("lisi", "welcome");
        messages.put("wangwu", "hi");
    }
    public String doHello(String user) {
        String massage = messages.get(user);
        return massage + ", " + user + "!";
    }
}

@WebServlet("/request/hello.do")
public class HelloController extends HttpServlet {
    private final HelloModel helloModel = new HelloModel();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String name = request.getParameter("user");
        String message = helloModel.doHello(name);
        request.setAttribute("message", message);
        request.getRequestDispatcher("hello.view").forward(request, response);
    }
}

@WebServlet("/request/hello.view")
public class HelloView extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        request.setCharacterEncoding("UTF-8");
        String user = request.getParameter("user");
        String message = (String) request.getAttribute("message");
        String htmlTemplate = ""
                + "<html>"
                + "<head>"
                + "<title>%s</title>"
                + "</head>"
                + "<body>"
                + "<p>%s</p>"
                + "</body>"
                + "</html>";
        String html = String.format(htmlTemplate, user, message);
        response.getWriter().print(html);
    }
}

/request/hello.do?user=zhangsan

<p>hello, zhangsan!</p>

4. 响应

4.1. 输出字符

response.setContentType("text/html;charset=UTF-8");

PrintWriter out = response.getWriter();

4.2. 输出二进制字符

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <locale-encoding-mapping-list>
    <locale-encoding-mapping>
      <locale>zh_CN</locale>
      <encoding>UTF-8</encoding>
    </locale-encoding-mapping>
  </locale-encoding-mapping-list>
  <mime-mapping>
    <extension>pdf</extension>
    <mime-type>application/pdf</mime-type>
  </mime-mapping>
</web-app>

@WebServlet("/download.do")
public class DownloadServlet extends HttpServlet {
    // ...
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws IOException {
    doPost(request, response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws IOException {
    request.setCharacterEncoding("UTF-8");
    // 设置内容类型
    response.setContentType("application/pdf");
    // 输入串流
    InputStream in = getServletContext().getResourceAsStream("WEB-INF/content.pdf");
    // 输出串流
    OutputStream out = response.getOutputStream();
    // 读取文件并输出到浏览器
    writeBytes(in, out);
}

private void writeBytes(InputStream in, OutputStream out)
        throws IOException {
    byte[] buffer = new byte[1024];
    int length;
    while ((length = in.read(buffer)) != -1) {
        out.write(buffer, 0, length);
    }
    in.close();
    out.close();
}

4.3. 重定向

@WebServlet("/redirect.do")
public class RedirectServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        response.sendRedirect("https://www.baidu.com");
        // String msg = "bad request";
        // response.sendError(HttpServletResponse.SC_BAD_REQUEST, msg);
    }
}

5. 基本会话管理

5.1. 使用隐藏域

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws IOException {
    request.setCharacterEncoding("UTF-8");
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    out.println("<html>");
    out.println("<head>");
    out.println("<title>QuestionServlet</title>");
    out.println("</head>");
    out.println("<body>");
    out.println("<form action='question.view' method='post'>");
    String page = request.getParameter("page");
    String nextPage = "下一页";
    String finish = "完成";
    if (page == null) {
        out.println("问题一：<input type='text' name='p1q1'><br>");
        out.println("问题一：<input type='text' name='p1q2'><br>");
        out.println("<input type='submit' name='page' value='下一页'>");
    } else if (nextPage.equals(page)) {
        String plq1 = request.getParameter("p1q1");
        String plq2 = request.getParameter("p1q2");
        out.println("问题三：<input type='text' name='p2q1'><br>");
        out.println("<input type='hidden' name='p1q1' value='" + plq1 + "'>");
        out.println("<input type='hidden' name='p1q2' value='" + plq2 + "'>");
        out.println("<input type='submit' name='page' value='完成'>");
    } else if (finish.equals(page)) {
        out.println(request.getParameter("p1q1") + "<br>");
        out.println(request.getParameter("p1q2") + "<br>");
        out.println(request.getParameter("p2q1") + "<br>");
    }
    out.println("</form>");
    out.println("</body>");
    out.println("</html>");
    out.close();
}

<form action="question.view" method="post">
  问题三：<input type="text" name="p2q1" /><br />
  <input type="hidden" name="p1q1" value="qqq" />
  <input type="hidden" name="p1q2" value="kkk" />
  <input type="submit" name="page" value="完成" />
</form>

5.2. 使用 Cookie

<form action="cookie/login.do" method="post">
  <div class="form-group">
    <label for="username">用户名: </label>
    <input id="username" class="form-control" type="text" name="username" value="" />
  </div>
  <div class="form-group">
    <label for="password">密码: </label>
    <input id="password" class="form-control" type="password" name="password" value="" />
  </div>
  <div class="form-group">
    <label for="login">记住我: </label>
    <input id="login" class="form-control" type="checkbox" name="login" value="auto" />
  </div>
  <button class="btn btn-primary" name="btn" value="submit">提交</button>
</form>

@WebServlet("/cookie/login.do")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String trueUsername = "zhangsan";
        String truePassword = "123456";
        String loginMode = "auto";
        if (trueUsername.equals(username) && truePassword.equals(password)) {
            String login = request.getParameter("login");
            if (loginMode.equals(login)) {
                Cookie cookie = new Cookie("user", username);
                cookie.setMaxAge(60 * 60 * 24 * 7);
                response.addCookie(cookie);
            }
            request.setAttribute("username", username);
            request.getRequestDispatcher("user.view").forward(request, response);
        } else {
            response.sendRedirect("../cookie_login.html");
        }
    }
}

@WebServlet("/cookie/user.view")
public class UserServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String usernameKey = "username";
        if (request.getAttribute(usernameKey) == null) {
            response.sendRedirect("../cookie_login.html");
        }
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>UserServlet</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<p>" + request.getAttribute(usernameKey) + "</p>");
        out.println("</body>");
        out.println("</html>");
        out.close();
    }
}

Set-Cookie: user=zhangsan; Max-Age=604800; Expires=date;

5.3. 使用 URL 重写

@WebServlet("/cookie/search.do")
public class SearchServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>SearchServlet</title>");
        out.println("</head>");
        out.println("<body>");
        int perPage = 10;
        int totalPages = 20;
        String page = request.getParameter("page");
        if (page == null) {
            page = "1";
        }
        int count = Integer.parseInt(page);
        int begin = 10 * count - 9;
        int end = 10 * count;
        out.println("<p>从 " + begin + " 到  " + end + " 的搜索结果</p>");
        out.println("<ul>");
        String line = "<li>搜索结果: %d</li>";
        for (int i = 0; i < perPage; i++) {
            out.println(String.format(line, begin + i));
        }
        out.println("</ul>");
        for (int i = 1; i <= totalPages; i++) {
            if (i == count) {
                out.print(i);
                continue;
            }
            out.println("<a href='search.do?page=" + i + "'>" + i + "</a>");
        }
        out.println("</body>");
        out.println("</html>");
        out.close();
    }
}

6. HttpSession

6.1. 实现隐藏域

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
    request.setCharacterEncoding("UTF-8");
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    out.println("<html>");
    out.println("<head>");
    out.println("<title>QuestionServlet</title>");
    out.println("</head>");
    out.println("<body>");
    out.println("<form action='question.view' method='post'>");
    String page = request.getParameter("page");
    String nextPage = "下一页";
    String finish = "完成";
    if (page == null) {
        out.println("问题一：<input type='text' name='p1q1'><br>");
        out.println("问题一：<input type='text' name='p1q2'><br>");
        out.println("<input type='submit' name='page' value='下一页'>");
    } else if (nextPage.equals(page)) {
        String plq1 = request.getParameter("p1q1");
        String plq2 = request.getParameter("p1q2");
        HttpSession session = request.getSession();
        session.setAttribute("p1q1", plq1);
        session.setAttribute("p1q2", plq2);
        out.println("问题三：<input type='text' name='p2q1'><br>");
        out.println("<input type='hidden' name='p1q1' value='" + plq1 + "'>");
        out.println("<input type='hidden' name='p1q2' value='" + plq2 + "'>");
        out.println("<input type='submit' name='page' value='完成'>");
    } else if (finish.equals(page)) {
        HttpSession session = request.getSession();
        out.println(session.getAttribute("p1q1") + "<br>");
        out.println(session.getAttribute("p1q2") + "<br>");
        out.println(request.getParameter("p2q1") + "<br>");
    }
    out.println("</form>");
    out.println("</body>");
    out.println("</html>");
    out.close();
}

6.2. 实现登录

@WebServlet("/session/login.do")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String trueUsername = "zhangsan";
        String truePassword = "123456";
        if (trueUsername.equals(username) && truePassword.equals(password)) {
            request.getSession().setAttribute("username", username);
            request.getRequestDispatcher("user.view").forward(request, response);
        } else {
            response.sendRedirect("../session_login.html");
        }
    }
}

@WebServlet("/session/user.view")
public class UserServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String usernameKey = "username";
        if (request.getSession().getAttribute(usernameKey) == null) {
            response.sendRedirect("../session_login.html");
        }
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>UserServlet</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<p>" + request.getSession().getAttribute(usernameKey) + "</p>");
        out.println("<a href='logout.view'>注销</a>");
        out.println("</body>");
        out.println("</html>");
        out.close();
    }
}

@WebServlet("/session/logout.view")
public class LogoutServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        HttpSession session = request.getSession();
        String username = (String) session.getAttribute("username");
        session.invalidate();
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>LogoutServlet</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<p>" + username + " 已注销</p>");
        out.println("</body>");
        out.println("</html>");
        out.close();
    }
}

<web-app>
  <session-config>
    <!-- minutes -->
    <session-timeout>30</session-timeout>
    <cookie-config>
      <name>sid</name>
      <http-only>true</http-only>
    </cookie-config>
  </session-config>
</web-app>

6.3. 实现 URL 重写

@WebServlet("/session/counter.do")
public class CounterServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        int count = 0;
        String countStr = "count";
        HttpSession session = request.getSession();
        if (session.getAttribute(countStr) != null) {
            Integer c = (Integer) session.getAttribute(countStr);
            count = c + 1;
        }
        session.setAttribute(countStr, count);
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>CounterServlet</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<p>Servlet Count: " + count + " </p>");
        out.println("<a href='" + response.encodeURL("counter") + ".do'>递增</a>");
        out.println("</body>");
        out.println("</html>");
        out.close();
    }
}

Name	Name	Last commit message	Last commit date
Latest commit History 1 Commit 1 Commit
src	src
.gitattributes	.gitattributes
.gitignore	.gitignore
README.md	README.md
pom.xml	pom.xml

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JavaWeb-Servlet

1. Web 应用程序简介

2. 编写与设置 Servlet

2.1. 第一个 Servlet 程序

2.2. URL 模式设置

3. 请求

3.1. 处理请求参数与标头

3.2. 请求参数编码处理

3.2.1. get 请求

3.2.2. post 请求

3.3. 读取 Body 内容

3.4. 获取上传文件

3.4.1. upload1

3.4.2. upload2

3.4.3. upload3

3.4.4. upload4

3.5. 调派请求

3.5.1. include

3.5.2. forward

4. 响应

4.1. 输出字符

4.2. 输出二进制字符

4.3. 重定向

5. 基本会话管理

5.1. 使用隐藏域

5.2. 使用 Cookie

5.3. 使用 URL 重写

6. HttpSession

6.1. 实现隐藏域

6.2. 实现登录

6.3. 实现 URL 重写

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