javaweb之request获取请求头和请求数据
翻译
2014年03月07日 22:43:22
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[java]
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package test.request; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.InvocationTargetException; import java.util.Enumeration; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.sun.org.apache.commons.beanutils.BeanUtils; public class RequestDemo2 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("---------获取请求数据方式1-------------"); String value = request.getParameter("username"); if (value != null && !value.trim().equals("")) { System.out.println(value); } System.out.println("---------获取请求数据方式2-------------"); Enumeration e = request.getParameterNames(); while (e.hasMoreElements()) { String paramName = (String) e.nextElement(); String value2 = request.getParameter(paramName); System.out.println(paramName + "=" + value2); } System.out.println("---------获取请求数据方式3-------------"); String[] values = request.getParameterValues("username"); for (int i = 0; values != null && i < values.length; i++) { System.out.println(values[i]); } System.out.println("---------获取请求数据方式4-------------"); Map<String, String[]> map = request.getParameterMap(); User user = new User(); try { BeanUtils.populate(user, map); } catch (IllegalAccessException e1) { e1.printStackTrace(); } catch (InvocationTargetException e1) { e1.printStackTrace(); } System.out.println(user.getPassword()); System.out.println("---------获取请求数据方式5-------------"); InputStream in = request.getInputStream(); int len = 0; byte[] buffer = new byte[1024]; while ((len = in.read(buffer)) > 0) { System.out.println(new String(buffer, 0, len)); } } private void test1(HttpServletRequest request) { System.out.println("---------获取请求头方式1-------------"); System.out.println(request.getHeader("cache-control")); System.out.println("---------获取请求头方式2-------------"); Enumeration e = request.getHeaders("cache-control"); while (e.hasMoreElements()) { String headValue = (String) e.nextElement(); System.out.println(headValue); } System.out.println("---------获取请求头方式3-------------"); Enumeration e1 = request.getHeaderNames(); while (e1.hasMoreElements()) { String headerName = (String) e1.nextElement(); String headValue = request.getHeader(headerName); System.out.println(headerName + "=" + headValue); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
[java]
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package test.request; public class User { private String[] username; public String[] getUsername() { return username; } public void setUsername(String[] username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } private String password; }
[html]
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>给RequestDemo2发送请求数据</title> </head> <body> <a href="/day06/servlet/RequestDemo2?username=xxx">点点</a><br/> <form action="/day06/servlet/RequestDemo2" method="post"> 用户名1:<input type="text" name="username"/><br/> 用户名2:<input type="text" name="username"/><br/> 密码:<input type="password" name="password"/><br/> <input type="submit" value="提交"/> </form> </body> </html>
此程序还需用到commons-beanutils-1.9.0.jar和commons-logging-1.1.3.jar这两个jar包
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