解决Servlet中文乱码问题-优快云博客


<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Insert title here</title>
</head>
<body>
<form action="SayHelloServlet">
 <input name="userPwd" id="userPwd" size="14" tabindex="2">
 <input type=submit >

</form>
</body>
</html>


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

/**
 * Servlet implementation class for Servlet: SayHelloServlet
 * 
 */
public class SayHelloServlet extends javax.servlet.http.HttpServlet implements
		javax.servlet.Servlet {
	static final long serialVersionUID = 1L;

	/*
	 * (non-Java-doc)
	 * 
	 * @see javax.servlet.http.HttpServlet#HttpServlet()
	 */
	public SayHelloServlet() {
		super();
	}

	/*
	 * (non-Java-doc)
	 * 
	 * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request,
	 *      HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String str = (String) request.getParameter("userPwd");
		String str_new= new String(str.getBytes("ISO-8859-1"),"GB2312");
		System.out.println("转换前： "+str);
		System.out.println("转换后： "+str_new);
	}

	/*
	 * (non-Java-doc)
	 * 
	 * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request,
	 *      HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}
}


在tomcat的内部，都是以iso8859-1来编码的，这样在servlet里取出来再用utf8来解码，就会产生乱码，可以手动的用new string（getbytes）来解码，或者直接的在setEncoding里设置也可以。