使用httpclient调用post方式api，post时，直接传递一个json

PostJsonExample.java

package client;

import java.io.IOException;
import java.nio.charset.Charset;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

/**
 * 调用post方法，传输json内容
 * 
 * @author weizhankui
 * 
 */
public class PostJsonExample {
	public static void visitPostUrl() throws ClientProtocolException,
			IOException {
		HttpClient httpclient = new DefaultHttpClient();
		HttpPost httppost = new HttpPost(
				"http://localhost:8080/msg/testjson?apikey=apikey");

		String jsonStr = "{\"name\":\"张三\",\"add\":\"北京市朝阳区\"}";
		// 传json，并设置编码
		httppost.setEntity(new StringEntity(jsonStr, "UTF-8"));
		System.out.println("执行: " + httppost.getRequestLine());

		HttpResponse response = httpclient.execute(httppost);
		HttpEntity resEntity = response.getEntity();

		// 返回状态码
		StatusLine statusLine = response.getStatusLine();
		if (statusLine.getStatusCode() >= 300) {
			System.out.println("出错了" + statusLine.getReasonPhrase());
		}
		// 返回值
		if (resEntity != null) {
			System.out.println(new String(EntityUtils.toByteArray(resEntity),
					Charset.forName("utf-8")));
		}
	}

	public static void main(String[] args) {
		try {
			visitPostUrl();
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}