Web开发基础_Servlet学习_0005_Servlet处理中文乱码

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乱码问题

案例演示：

工程案例目录结构

pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.study</groupId>
  <artifactId>Servlet02</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
  	<dependency>
  		<groupId>javaee</groupId>
  		<artifactId>javaee-api</artifactId>
  		<version>5</version>
  	</dependency>
  </dependencies>
</project>

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>注册</title>
	</head>
	<body>
		<!-- 
			绝对路径：
				/Servlet02/register
			相对路径：
				当前：/Servlet02/register.html
				目标：/Servlet02/register
		 -->
		<form action="register" method="post">
			<p>
				账户：<input type="text" name="code"/>
			</p>
			<p>
				密码：<input type="password" name="pwd" />
			</p>
			<p>
				性别：
				<input type="radio" name="sex" value="M"/>男
				<input type="radio" name="sex" value="F"/>女
			</p>
			<p>
				兴趣：
				<input type="checkbox" name="interest" value="basketball"/>篮球
				<input type="checkbox" name="interest" value="football"/>足球
				<input type="checkbox" name="interest" value="tableball"/>桌球
			</p>
			<p>
				<input type="submit" value="注册"/>
			</p>
		</form>
	
	</body>
</html>

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <display-name>Servlet02</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
  	<servlet-name>register</servlet-name>
  	<servlet-class>web.RegisterServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>register</servlet-name>
  	<url-pattern>/register</url-pattern>
  </servlet-mapping>
</web-app>

RegisterServlet.java

package web;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RegisterServlet extends HttpServlet{

	@Override
	protected void service(HttpServletRequest req, 
			HttpServletResponse res) throws ServletException, IOException {
		//req.setCharacterEncoding("utf-8");
		//通过request获取请求数据
		//getParameter(name) -> String
		//getParameterValues(name) -> String[]
		String code = req.getParameter("code");
		String pwd = req.getParameter("pwd");
		String sex = req.getParameter("sex");
		String[] interests = req.getParameterValues("interest");
		
		//处理乱码
		code =new String(code.getBytes("iso8859-1"),"utf-8");
		
		
		System.out.println(code);
		System.out.println(pwd);
		System.out.println(sex);
		if(interests !=null){
			for(String interest : interests){
				System.out.println(interest);
			}
		}
		
		res.setContentType("text/html;charset=utf-8");
		PrintWriter pw = res.getWriter();
		pw.println("<h1>注册成功.</h>");
		pw.close();
	}

	
}

将Servlet02工程部署到Tomcat上，运行Tomcat启动案例工程，

浏览器录入http://localhost:8080/Servlet02/register.html即可：如果没有错误，最终页面展示效果应如下图：