关于 jsp java servlet 中文汉字乱码的解决方法

在servlet类中的get,post最前面加上

req.setCharacterEncoding("UTF-8");
resp.setCharacterEncoding("UTF-8");

对接收到的汉字字符串转码

String name = req.getParameter("name");
        String deptName = req.getParameter("deptName");
        name = new String(name.getBytes("ISO-8859-1"), "UTF-8");
        deptName = new String(deptName.getBytes("ISO-8859-1"), "UTF-8");
``

![这里写图片描述](http://images2017.cnblogs.com/blog/1218254/201712/1218254-20171214204548154-1427421227.png)`


完整样例：

package servlet;

import Dao.DeptDao;
import Dao.EmpDao;
import entity.Emp;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

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

public class EmpServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String action = req.getParameter(“action”);
req.setCharacterEncoding(“UTF-8”);
resp.setCharacterEncoding(“UTF-8”);
if(“listEmp”.equals(action)){
listEmp(req,resp);
}
}

private void listEmp(HttpServletRequest req, HttpServletResponse resp){
    JSONArray result = EmpDao.listEmp();
    PrintWriter pw = null;
    try {
        pw = resp.getWriter();
        pw.println(result);
        pw.flush();
        pw.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    String action = req.getParameter("action");
    req.setCharacterEncoding("UTF-8");
    resp.setCharacterEncoding("UTF-8");
    if("addEmp".equals(action)){
        try {
            addEmp(req,resp);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

private void addEmp(HttpServletRequest req, HttpServletResponse resp) throws JSONException, UnsupportedEncodingException {
    String name = req.getParameter("name");
    String deptName = req.getParameter("deptName");
    name = new String(name.getBytes("ISO-8859-1"), "UTF-8");
    deptName = new String(deptName.getBytes("ISO-8859-1"), "UTF-8");

    int deptId = DeptDao.reConvert(deptName);
    JSONObject result = EmpDao.addEmp(name,deptId);
    try {
        PrintWriter pw = resp.getWriter();
        pw.println(result);
        pw.flush();
        pw.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

} “`