HttpClient 实际小应用

超、凢脫俗 2022-06-11 05:09 154阅读 0赞

工作中根据公司代码风格编写的HttpClient测试Util,有需要的同事可以借用下;

HttpClient入门地址:https://www.ibm.com/developerworks/cn/opensource/os-httpclient/

代码如下:

import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.Map; 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 com.google.gson.Gson; public class HttpClientUtil {  /**   *   * @param reqList 访问的参数，注意查看代码中的解析List中的Map只有两个值 key 与 value   * @param url  访问的地址   * @return   void -> Bean(返回结果转化为你需要的Bean)   */  public static void executeRequest(List<Map> reqList, String url){   List<HttpParam> list = new ArrayList<HttpParam>();   HttpParam httpParam = new HttpParam();   httpParam.setKey("req");   httpParam.setValue(getValue(reqList));   list.add(httpParam);   String resutl = executeRequest(list,url);   resutl = resutl.substring(8, resutl.length()-1);   System.out.println(resutl);   //Gson gson = new Gson();   //结果Bean respBean = gson.fromJson(resutl, 结果Bean.class);   //return respBean;  }  /**   * 获取参数的方法(按照代码传参的规则来修改)   * @param list   * @param flag   * @return   */  private static String getValue(List<Map> list) {   StringBuffer data = new StringBuffer();   data.append("{");   if(list != null && list.size() > 0){    for(int i = 0; i < list.size(); i++) {     Map map = list.get(i);     data.append("\"");     data.append(nvlTOString( map.get("key"), "key" ));     data.append("\":\"");     data.append(nvlTOString( map.get("value"), "value" ));     data.append("\"");    }   }   data.append("}");   return data.toString();  }  public static String nvlTOString(Object inObject,String defaultString){   String retString = "";   if(inObject!=null){    retString=String.valueOf(inObject).toString();   }else{    retString=defaultString;   }   return retString;  }  /**   * HttpClient调用接口   * @param list   * @param url   * @return   */  public static String executeRequest(List<HttpParam> list, String url) {   // 响应内容   String result = "";   // 定义http客户端对象--httpClient   HttpClient httpClient = new HttpClient();   // 定义并实例化客户端链接对象-postMethod   PostMethod postMethod = new PostMethod(url);   try {    // 设置http的头    postMethod.setRequestHeader("ContentType",      "application/x-www-form-urlencoded;charset=UTF-8");    // 将表单的值放入postMethod中    postMethod.setRequestBody(convMap(list));    // 定义访问地址的链接状态    int statusCode = 0;    try {     // 客户端请求url数据     statusCode = httpClient.executeMethod(postMethod);    } catch (Exception e) {     e.printStackTrace();    }    System.out.println("statusCode:  " + statusCode + "   DESC: "      + postMethod.getStatusText());    // 请求成功状态-200    if (statusCode == HttpStatus.SC_OK) {     try {      //String charSet =  postMethod.getResponseCharSet();      result = postMethod.getResponseBodyAsString();      //System.out.println("返回结果的编码格式 = " + charSet);      //byte[] bytes = result.getBytes("ISO-8859-1"); //解码      //result = new String(bytes,"UTF-8"); //编码     } catch (IOException e) {      e.printStackTrace();     }    } else {     System.out.println("请求返回状态 = " + statusCode);    }   } catch (Exception e) {    System.out.println(e.getMessage());   } finally {    // 释放链接    postMethod.releaseConnection();    httpClient.getHttpConnectionManager().closeIdleConnections(0);   }   return result;  }  private static NameValuePair[] convMap(List<HttpParam> paramList) {   // 请求参数   NameValuePair[] data = null;   // 设置请求参数   if (paramList != null) {    data = new NameValuePair[paramList.size()];    for (int i = 0; i < paramList.size(); i++) {     data[i] = new NameValuePair(paramList.get(i).getKey(),       paramList.get(i).getValue());    }   }   return data;  } } /**  * HttpClient参数Bean  * @author User  *  */ class HttpParam {  /**   * 入参KEY   */  private String key;  /**   * 入参VALUE   */  private String value;  public String getKey() {   return key;  }  public void setKey(String key) {   this.key = key;  }  public String getValue() {   return value;  }  public void setValue(String value) {   this.value = value;  }  @Override  public String toString() {   return "HttpParam [key=" + key + ", value=" + value + "]";  } } 希望对你有帮助，祝你有一个好心情，加油！ 若有错误、不全、可优化的点，欢迎纠正与补充！