http 解决post请求重定向的问题

最新推荐文章于 2021-07-27 19:17:37 发布

原创最新推荐文章于 2021-07-27 19:17:37 发布 · 3.7k 阅读

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#重定向 #java

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本文介绍了一个使用Apache HttpClient库实现的Java类，用于发送POST请求并处理重定向。该类能够接收URL和参数映射，自动处理301和302重定向，返回服务器响应的字符串结果。

import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

/**
 * @ClassName HttpClientUtil
 * @Description: TODO
 * @Author wzq
 * @Date 2019/12/9
 * @Version V1.0
 **/
public class HttpClientUtil {

    public static String getPostResponse(String url, Map<String, String> parmMap) throws IOException {

        String result = "";
        PostMethod post = new PostMethod(url);
        HttpClient client = new HttpClient();
        Iterator it = parmMap.entrySet().iterator();
        NameValuePair[] param = new NameValuePair[parmMap.size()];
        int i = 0;
        while (it.hasNext()) {
            Map.Entry parmEntry = (Map.Entry) it.next();
            param[i++] = new NameValuePair((String) parmEntry.getKey(), (String) parmEntry.getValue());
        }

        post.setRequestBody(param);
        try {
            int statusCode = client.executeMethod(post);

            if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
                Header locationHeader = post.getResponseHeader("location");
                String location = "";
                if (locationHeader != null) {
                    location = locationHeader.getValue();
                    result = getPostResponse(location, parmMap);//用跳转后的页面重新请求�??
                }
            } else if (statusCode == HttpStatus.SC_OK) {
                result = post.getResponseBodyAsString();
            }
        } catch (
                IOException ex) {
        } finally {
            post.releaseConnection();
        }
        return result;
    }

}