Question

我有一个简单的控制器，例如

    @Controller
    @RequestMapping("/")
    public class HelloController {
        @RequestMapping(method = RequestMethod.GET)
        public String printWelcome(ModelMap model) throws NoSuchAlgorithmException {
...
     model.addAttribute("startDate", startDate);
     model.addAttribute("endDate", endDate);
     model.addAttribute("msisdn", msisdn);
            return "hello";
        }

带有POST请求的简单表单的ome JSP页面

<form action="http://1.....:8887/getCallDetailGeneral" method="post" enctype="multipart/form-data">
    <input type="hidden" name="startDate" value="${startDate}"/>
    <input type="hidden" name="endDate" value="${endDate}"/>
    <input type="hidden" name="msisdn" value="${msisdn}"/>
    <input type="submit" value="send">
</form>

当我按下send按钮时，我发送POST请求并得到一些回复。

我不明白如何从此响应中获取参数？或我的代码错误。

例如，这个响应返回给我JSON字符串。我怎样才能将它传递给我的java代码（新的或这个控制器）

Answer 1

我假设您向getCallDetailGeneral提交POST请求，并且需要读取JSON的响应。如果您使用的是jquery，则可以POST到getCallDetailGeneral并读取json响应。

Answer 2

您可以使用或 The Apache HttpComponents 库与远程服务器进行交互。

使用 Apache HttpComponents 库解决方案：

将依赖添加到pom.xml：

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.1</version>
</dependency>

表格：

<form action="/" method="post">
    <input type="text" name="startDate"/>
    <input type="text" name="endDate"/>
    <input type="text" name="msisdn"/>
    <input type="submit"/>
</form>

通过GET方法制作控制器 展示表单 ：

@RequestMapping(method = RequestMethod.GET)
public String indexController(){
    return "index";
}

通过Rest.java方法从表单中创建控制器（POST）而不是 接收参数 ， 传递它们到远程服务器 ：

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@RestController
public class Rest {
    @RequestMapping(method = RequestMethod.POST)
    public String getData(@RequestParam(value="startDate") String startDate,
                          @RequestParam(value="endDate") String endDate,
                          @RequestParam(value="msisdn") String msisdn) throws IOException {

        String result = "";
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpPost httpPost = new HttpPost("http://localhost:8080");

            List<NameValuePair> urlParameters = new ArrayList<>();
            urlParameters.add(new BasicNameValuePair("startDate", startDate));
            urlParameters.add(new BasicNameValuePair("endDate", endDate));
            urlParameters.add(new BasicNameValuePair("msisdn", msisdn));
            HttpEntity postParams = new UrlEncodedFormEntity(urlParameters);
            httpPost.setEntity(postParams);

            result += "Executing request " + httpPost.getRequestLine() + "\n";

            //Create a custom response handler
            ResponseHandler<String> responseHandler = new ResponseHandler<String>() {

                @Override
                public String handleResponse(
                        final HttpResponse response) throws ClientProtocolException, IOException {
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {
                        HttpEntity entity = response.getEntity();
                        return entity != null ? EntityUtils.toString(entity) : null;
                    } else {
                        throw new ClientProtocolException("Unexpected response status: " + status);
                    }
                }

            };
            String responseBody = httpclient.execute(httpPost, responseHandler);
            result += responseBody;
        } finally {
            httpclient.close();
        }

        return result;
    }
}

将http://localhost:8080替换为您的远程服务器地址;

您可以使用以下代码从远程服务器获取响应：

String responseBody = httpclient.execute(httpPost, responseHandler);
result += responseBody;

jsoup 库的解决方案：

将依赖添加到pom.xml：

<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.8.3</version>
</dependency>

通过Rest.java方法从表单中创建控制器（POST）而不是 接收参数 ， 传递它们到远程服务器 ：

import org.jsoup.Jsoup;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;

@RestController
public class Rest {
    @RequestMapping(method = RequestMethod.POST)
    public String getData(@RequestParam(value="startDate") String startDate,
                          @RequestParam(value="endDate") String endDate,
                          @RequestParam(value="msisdn") String msisdn) throws IOException {

        return Jsoup.connect("http://localhost:8080")
                .data("startDate", startDate)
                .data("endDate", endDate)
                .data("msisdn", msisdn)
                .post()
                .toString();
    }
}

POST请求后如何从响应中获取参数？

2 个答案: