Request和Response学习笔记4

Request 获取请求参数，中文乱码问题

实例引入：

创建一个html文件：garbled.html

复制 <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>中文乱码问题</title>
</head>
<body>
    <form action="/RequestResponseCharset_war_exploded/demo01" method="get">
        <label><input type="text" name="username" placeholder="请输入用户名"></label><br>
        <label><input type="password" name="password" placeholder="请输入密码"></label><br>
        <input type="submit" value="get提交">
    </form>
    <br>
    <form action="/RequestResponseCharset_war_exploded/demo01" method="post">
        <label><input type="text" name="username" placeholder="请输入用户名"></label><br>
        <label><input type="password" name="password" placeholder="请输入密码"></label><br>
        <input type="submit" value="post提交">
    </form>
</body>
</html>

创建一个类：CharsetGarbled.java

复制 import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
/**
 * @Author: YiHua Lee
 * @Version: 1.8.0_201       Java SE 8
 * @Application: IntelliJ IDEA
 * @CreateTime: 2020/5/18 22:10
 * @Description:
 */
@WebServlet("/demo01")
public class CharsetGarbled extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // 获取请求参数
        String username = req.getParameter("username");
        System.out.println(username);
    }
 
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

启动服务器，浏览器访问：http://localhost:8080/RequestResponseCharset_war_exploded/garbled.html
- get提交
  
  控制台输出：
```
复制 彩虹
```
  浏览器页面跳转到：http://localhost:8080/RequestResponseCharset_war_exploded/demo01?username=%E5%BD%A9%E8%99%B9&password=2018
- post提交
  
  控制台输出：
```
复制 å½©è¹
```
  浏览器页面跳转到：http://localhost:8080/RequestResponseCharset_war_exploded/demo01

解决中文乱码问题

只需要改动doGet()方法即可：

复制 @Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {
    // 设置流的编码
    req.setCharacterEncoding("utf-8");
 
    // 获取请求参数
    String username = req.getParameter("username");
    System.out.println(username);
}

重启服务器，再次访问：http://localhost:8080/RequestResponseCharset_war_exploded/garbled.html

并用post提交，控制台输出：
```
复制 彩虹
```
浏览器页面跳转到：http://localhost:8080/RequestResponseCharset_war_exploded/demo01

参考文献

posted @ 2021-03-03 22:42 LeeHua 阅读(99) 评论(0) 编辑收藏举报

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Request和Response学习笔记4

Request 获取请求参数，中文乱码问题

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目录导航

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>中文乱码问题</title>
	</head>
	<body>
	<form action="/RequestResponseCharset_war_exploded/demo01" method="get">
	<label><input type="text" name="username" placeholder="请输入用户名"></label><br>
	<label><input type="password" name="password" placeholder="请输入密码"></label><br>
	<input type="submit" value="get提交">
	</form>
	<br>
	<form action="/RequestResponseCharset_war_exploded/demo01" method="post">
	<label><input type="text" name="username" placeholder="请输入用户名"></label><br>
	<label><input type="password" name="password" placeholder="请输入密码"></label><br>
	<input type="submit" value="post提交">
	</form>
	</body>
	</html>

	import javax.servlet.ServletException;
	import javax.servlet.annotation.WebServlet;
	import javax.servlet.http.HttpServlet;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpServletResponse;
	import java.io.IOException;

	/**
	* @Author: YiHua Lee
	* @Version: 1.8.0_201 Java SE 8
	* @Application: IntelliJ IDEA
	* @CreateTime: 2020/5/18 22:10
	* @Description:
	*/
	@WebServlet("/demo01")
	public class CharsetGarbled extends HttpServlet {
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
	throws ServletException, IOException {
	// 获取请求参数
	String username = req.getParameter("username");
	System.out.println(username);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
	throws ServletException, IOException {
	this.doGet(req, resp);
	}
	}