java积累---HttpDelete请求方式传递参数

look_w

一般 HttpPost 对传参 Json 的处理是:

// 中文处理

StringEntity se = new StringEntity(json, Consts.UTF_8);
httppost.setEntity(se);


HttpPost、HttpPut继承了HttpEntityEnclosingRequestBase类，所以有setEntity方法。详情请自行查看源码。

查看httpclient-4.2.3的源码可以发现，methods包下面包含HttpGet, HttpPost, HttpPut, HttpDelete等类来实现http的常用操作。

其中，HttpPost继承自 HttpEntityEnclosingRequestBase，HttpEntityEnclosingRequestBase类又实现了 HttpEntityEnclosingRequest接口，实现了setEntity的方法。

而HttpDelete继承自HttpRequestBase，没有实现setEntity的方法，因此无法设置HttpEntity对象。

而HttpDelete没有对应的setEntity()方法，那么怎么传递呢？

在网上找到了一种解决办法：

package net.dn.client;

import java.io.IOException;
import java.net.URI;
import org.apache.http.Header;
import org.apache.http.annotation.NotThreadSafe;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;


@NotThreadSafe
class HttpDeleteWithBody extends HttpEntityEnclosingRequestBase {
    public static final String METHOD_NAME = "DELETE";

    public String getMethod() {
        return METHOD_NAME;
    }

    public HttpDeleteWithBody(final String uri) {
        super();
        setURI(URI.create(uri));
    }

    public HttpDeleteWithBody(final URI uri) {
        super();
        setURI(uri);
    }

    public HttpDeleteWithBody() {
        super();
    }
}

public class ClientMain {
    public static void main(String[] args) throws ClientProtocolException, IOException {

        CloseableHttpClient httpclient = HttpClients.createDefault();

        String url = "http://localhost:8080/RESTfulDeleteWithBody/rest";

        HttpDeleteWithBody httpDelete = new HttpDeleteWithBody(url);
        StringEntity input = new StringEntity("John Dow", ContentType.APPLICATION_JSON);
         
        httpDelete.setEntity(input);  

        System.out.println("****REQUEST***************************************");
        System.out.println(url);
        Header requestHeaders[] = httpDelete.getAllHeaders();
        for (Header h : requestHeaders) {
            System.out.println(h.getName() + ": " + h.getValue());
        }

        CloseableHttpResponse response = httpclient.execute(httpDelete);

        System.out.println("****RESPONSE***************************************");
        System.out.println("----status:---------------------");
        System.out.println(response.getStatusLine());
        System.out.println("----header:---------------------");
        Header responseHeaders[] = response.getAllHeaders();
        for (Header h : responseHeaders) {
            System.out.println(h.getName() + ": " + h.getValue());
        }
        System.out.println("----content:---------------------");
        System.out.println(EntityUtils.toString(response.getEntity()));
    }
}



然后就可以直接调用了，调用方式如下；

HttpDeleteWithBody httpDelete = new HttpDeleteWithBody(url);

// json 处理
httpdelete.setHeader("Content-Type", "application/json; charset=UTF-8");//or addHeader();
httpdelete.setHeader("X-Requested-With", "XMLHttpRequest");
//设置HttpDelete的请求参数
httpdelete.setEntity(new StringEntity(paramsJsonStr));
httpDelete.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 20000);
httpdelete.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 20000);
HttpResponse response = client.execute(httpdelete);