java响应重定向发送post请求

关于重定向我们用的比较多的还是redirect：重定向，默认发送的get请求。

return "redirect:/index";

但有时候请求地址必须为post请求，比如security登录就只能接收post请求，下面来看一下如何后台如何发送post请求响应重定向。

首先可以定义一个map，用于存放参数键值对

Map<String, String> parameter = new HashMap<String, String>();

添加参数方法

public void setParameter(String key, String value) {
    this.parameter.put(key, value);
}

发送请求代码：

//url参数为请求地址
public void sendByPost(String url) throws IOException {
    this.response.setContentType("text/html");
    response.setCharacterEncoding("utf-8");
    response.setContentType("text/html;charset=utf-8");
    PrintWriter out = this.response.getWriter();
    out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    out.println("<HTML>");
    out.println(" <HEAD>");
    out.println(" <meta http-equiv=Content-Type content=\"text/html; charset=utf-8\">");
    out.println(" <TITLE>loading</TITLE>");
    out.println(" <meta http-equiv=\"Content-Type\" content=\"text/html charset=GBK\">\n");
    out.println(" </HEAD>");
    out.println(" <BODY>");
    out.println("<form name=\"submitForm\" action=\"" + url + "\" method=\"post\">");
    Iterator<String> it = this.parameter.keySet().iterator();
    while (it.hasNext()) {
        String key = it.next();
        out.println("<input type=\"hidden\" name=\"" + key + "\" value=\"" + this.parameter.get(key) + "\"/>");
    }
    out.println("</from>");
    out.println("<script>window.document.submitForm.submit();</script> ");
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close();
}

RedirectWithPost请求类全部代码

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * 用POST方式 重定向
 *
 * @author royFly
 */
public class RedirectWithPost {
    Map<String, String> parameter = new HashMap<String, String>();
    HttpServletResponse response;

    public RedirectWithPost(HttpServletResponse response) {
        this.response = response;
    }

    public void setParameter(String key, String value) {
        this.parameter.put(key, value);
    }

    public void sendByPost(String url) throws IOException {
        this.response.setContentType("text/html");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = this.response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println(" <HEAD>");
        out.println(" <meta http-equiv=Content-Type content=\"text/html; charset=utf-8\">");
        out.println(" <TITLE>loading</TITLE>");
        out.println(" <meta http-equiv=\"Content-Type\" content=\"text/html charset=GBK\">\n");
        out.println(" </HEAD>");
        out.println(" <BODY>");
        out.println("<form name=\"submitForm\" action=\"" + url + "\" method=\"post\">");
        Iterator<String> it = this.parameter.keySet().iterator();
        while (it.hasNext()) {
            String key = it.next();
            out.println("<input type=\"hidden\" name=\"" + key + "\" value=\"" + this.parameter.get(key) + "\"/>");
        }
        out.println("</from>");
        out.println("<script>window.document.submitForm.submit();</script> ");
        out.println(" </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }
}

实例化RedirectWithPost请求类

RedirectWithPost redirectWithPost = new RedirectWithPost(response);
//redirectUrl请求地址
String redirectUrl = "/login";

添加请求参数

redirectWithPost.setParameter("username", nickname);
redirectWithPost.setParameter("password", openid);

调用方法，发送请求

redirectWithPost.sendByPost(redirectUrl);

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