Get与Post提交与中文乱码解决

android客户端请求服务端的url地址中含有中文时将会产生中文乱码问题。

产生乱码的原因有主要以下几个方面：

1.当以get方式请求服务端的资源时，没有对url中的中文进行编码。

2.忽略了tomcat默认的编码格式（iso8859-1）。

3.servlet没有对request和response设置正确的编码格式。

4.servlet没有处理get请求方式中的乱码问题。

解决方案：

GET请求

public static String LoginByGet(String username, String pwd) {

try {
//URLEncoder解决中文乱码
String path = "http://192.168.51.21:8080/Page/login?username=" +
URLEncoder.encode(username,"utf-8") + "&password=" +URLEncoder.encode(pwd,"utf-8") ;
URL url = new URL(path);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setConnectTimeout(5000);
con.setRequestMethod("GET");
int code = con.getResponseCode();
if(code==200){
InputStream is=con.getInputStream();
String res;
res = StreamTools.ReadInputStream(is);
return res;
}else{
return null;
}

} catch (Exception e) {
e.printStackTrace();
}
return null;
}

POST请求：

public static String LoginByPost(String username, String pwd) {
String path = "http://192.168.51.21:8080/Page/login";
try {
URL url = new URL(path);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setConnectTimeout(5000);
con.setRequestMethod("POST");

String data="username=" + username +"&password=" + pwd;
//设置post请求必要的请求头
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
con.setRequestProperty("Content-Length",data.getBytes().length+"");//length必须是字符串二进制的长度

con.setDoOutput(true);//准备写出
OutputStream os=con.getOutputStream();
os.write(data.getBytes("utf-8"));//向浏览器写数据,并设置编码格式
int code = con.getResponseCode();
if(code==200){
InputStream is=con.getInputStream();
String res= StreamTools.ReadInputStream(is);
return res;
}else{
return null;
}

} catch (Exception e) {
e.printStackTrace();
}
return null;
}

得到响应数据的处理ReadInputStream类

public class StreamTools {
public static String ReadInputStream(InputStream is) throws IOException {
ByteArrayOutputStream bayo = new ByteArrayOutputStream();
int len = 0;
byte[] buffer = new byte[1024];
while ((len = is.read(buffer)) != -1) {
bayo.write(buffer, 0, len);
}
is.close();
bayo.close();
byte[] res=bayo.toByteArray();
String str=new String(res);
return str;
}
}

WEB服务器端

package com.haitun.example;

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

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

/**
* Servlet implementation class Login
*/
@WebServlet("/Login")
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;

public Login() {
super();
// TODO Auto-generated constructor stub
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//服务端对request和response设置正确的编码格式
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String username=request.getParameter("username");
String password=request.getParameter("password");
//之所以要判断一下请求的方式是是否为get,是因为如果请求方式
//为post的话，又会变成乱码
if(request.getMethod().equalsIgnoreCase("get")){
username=new String(username.getBytes("ISO-8859-1"),"utf-8");
}
System.out.println(username);
PrintWriter out= response.getWriter();
if(password.equals("123")){
out.print("success");
}else{
out.print("失败");
}
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub
this.doGet(request, response);
}

}