java响应重定向发送post请求

傷城~ 2023-05-29 03:24 33阅读 0赞

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);