java调用post接口
1. java应用的post请求怎么实现
在Java应用中实现POST请求，通常有两种主流方法：通过URLConnection类和使用Apache HttpClient库。
使用URLConnection类发送POST请求，是基于Java标准库的功能。通过创建一个URL对象，然后通过其openConnection方法获取一个URLConnection实例，最后利用这个实例的setRequestMethod方法设置请求方式为POST，并通过setEntity方法设置请求体。然后调用其connect方法发起请求，最后读取响应信息。
而Apache HttpClient库的使用，则提供了一种更高级、更灵活的方式实现POST请求。通过创建HttpClient实例，使用其创建Post方法生成HttpPost对象，设置请求头如Content-Type等，再设置请求体，然后调用HttpClient实例的execute方法发起请求。最后读取并处理响应结果。
在实际开发中，选择哪种方法，主要取决于项目需求、团队习惯和对代码可维护性的考量。URLConnection适合轻量级应用，而Apache HttpClient适合对并发、异步操作有较高要求的场景。
2. java中怎样用post，get，put请求
java中用post，get，put请求方法：
public static String javaHttpGet(String url,String charSet){
String resultData = null;
try {
URL pathUrl = new URL(url); //创建一个URL对象
HttpURLConnection urlConnect = (HttpURLConnection) pathUrl.openConnection(); //打开一个HttpURLConnection连接
urlConnect.setConnectTimeout(30000); // 设置连接超时时间
urlConnect.connect();
if (urlConnect.getResponseCode() == 200) { //请求成功
resultData = readInputStream(urlConnect.getInputStream(), charSet);
}
} catch (MalformedURLException e) {
LogL.getInstance().getLog().error("URL出错！", e);
} catch (IOException e) {
LogL.getInstance().getLog().error("读取数据流出错！", e);
}
return resultData;
}
public static String javaHttpPost(String url,Map<String,Object> map,String charSet){
String resultData=null;
StringBuffer params = new StringBuffer();
try {
Iterator<Entry<String, Object>> ir = map.entrySet().iterator();
while (ir.hasNext()) {
Map.Entry<String, Object> entry = (Map.Entry<String, Object>) ir.next();
params.append(URLEncoder.encode(entry.getKey(),charSet) + "=" + URLEncoder.encode(entry.getValue().toString(), charSet) + "&");
}
byte[] postData = params.deleteCharAt(params.length()).toString().getBytes();
URL pathUrl = new URL(url); //创建一个URL对象
HttpURLConnection urlConnect = (HttpURLConnection) pathUrl.openConnection();
urlConnect.setConnectTimeout(30000); // 设置连接超时时间
urlConnect.setDoOutput(true); //post请求必须设置允许输出
urlConnect.setUseCaches(false); //post请求不能使用缓存
urlConnect.setRequestMethod("POST"); //设置post方式请求
urlConnect.setInstanceFollowRedirects(true);
urlConnect.setRequestProperty("Content-Type","application/x-www-form-urlencoded; charset="+charSet);// 配置请求Content-Type
urlConnect.connect(); // 开始连接
DataOutputStream dos = new DataOutputStream(urlConnect.getOutputStream()); // 发送请求参数
dos.write(postData);
dos.flush();
dos.close();
if (urlConnect.getResponseCode() == 200) { //请求成功
resultData = readInputStream(urlConnect.getInputStream(),charSet);
}
} catch (MalformedURLException e) {
LogL.getInstance().getLog().error("URL出错！", e);
} catch (IOException e) {
LogL.getInstance().getLog().error("读取数据流出错！", e);
} catch (Exception e) {
LogL.getInstance().getLog().error("POST出错！", e);
}
return resultData;
}
3. java语言使用post方式调用webService方式
WebService可以有Get、Post、Soap、Document四种方式调用，以下Java通过post方式调用WebService代码：
importjava.io.BufferedReader;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.InputStreamReader;
importjava.io.OutputStream;
importjava.io.OutputStreamWriter;
importjava.net.URL;
importjava.net.URLConnection;
importjava.net.URLEncoder;
importorg.apache.cxf.endpoint.Client;
importorg.apache.cxf.jaxws.endpoint.dynamic.JaxWsDynamicClientFactory;
/**
*功能描述：WebService调用
*
*/
publicclassClientTest{
/**
*功能描述：HTTP-POST
*
*/
publicStringpost(){
OutputStreamWriterout=null;
StringBuildersTotalString=newStringBuilder();
try{
URLurlTemp=newURL(
"http://www.webxml.com.cn/WebServices/WeatherWebService.asmx/getSupportCity");
URLConnectionconnection=urlTemp.openConnection();
connection.setDoOutput(true);
out=newOutputStreamWriter(connection.getOutputStream(),"UTF-8");
StringBuffersb=newStringBuffer();
sb.append("byProvinceName=福建");
out.write(sb.toString());
out.flush();
StringsCurrentLine;
sCurrentLine="";
InputStreaml_urlStream;
l_urlStream=connection.getInputStream();//请求
BufferedReaderl_reader=newBufferedReader(newInputStreamReader(
l_urlStream));
while((sCurrentLine=l_reader.readLine())!=null){
sTotalString.append(sCurrentLine);
}
}catch(Exceptione){
e.printStackTrace();
}finally{
if(null!=out){
try{
out.close();
}catch(IOExceptione){
e.printStackTrace();
}
}
}
returnsTotalString.toString();
}
}
4. java 接口调用，根据接口文档写测试，用post方法，刚怎么做啊，有个完整的例子么
可使用android自带的httpclient框架实现。
1. GET 方式传递参数
//先将参数放入List，再对参数进行URL编码
List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>();
params.add(new BasicNameValuePair("param1", "数据")); //增加参数1
params.add(new BasicNameValuePair("param2", "value2"));//增加参数2
String param = URLEncodedUtils.format(params, "UTF-8");//对参数编码
String baseUrl = "服务器接口完整URL";
HttpGet getMethod = new HttpGet(baseUrl + "?" + param);//将URL与参数拼接
HttpClient httpClient = new DefaultHttpClient();
try {
HttpResponse response = httpClient.execute(getMethod); //发起GET请求
Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码
Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8"));//获取服务器响应内容
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
2. POST方式 方式传递参数
//和GET方式一样，先将参数放入List
params = new LinkedList<BasicNameValuePair>();
params.add(new BasicNameValuePair("param1", "Post方法"));//增加参数1
params.add(new BasicNameValuePair("param2", "第二个参数"));//增加参数2
try {
HttpPost postMethod = new HttpPost(baseUrl);//创建一个post请求
postMethod.setEntity(new UrlEncodedFormEntity(params, "utf-8")); //将参数填入POST Entity中
HttpResponse response = httpClient.execute(postMethod); //执行POST方法
Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码
Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8")); //获取响应内容
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
5. java HttpPost怎么传递参数
public class HttpURLConnectionPost {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
readContentFromPost();
}
public static void readContentFromPost() throws IOException {
// Post请求的url，与get不同的是不需要带参数
URL postUrl = new URL("http://www.xxxxxxx.com");
// 打开连接
HttpURLConnection connection = (HttpURLConnection) postUrl.openConnection();
// 设置是否向connection输出，因为这个是post请求，参数要放在
// http正文内，因此需要设为true
connection.setDoOutput(true);
// Read from the connection. Default is true.
connection.setDoInput(true);
// 默认是 GET方式
connection.setRequestMethod("POST");
// Post 请求不能使用缓存
connection.setUseCaches(false);
//设置本次连接是否自动重定向
connection.setInstanceFollowRedirects(true);
// 配置本次连接的Content-type，配置为application/x-www-form-urlencoded的
// 意思是正文是urlencoded编码过的form参数
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
// 连接，从postUrl.openConnection()至此的配置必须要在connect之前完成，
// 要注意的是connection.getOutputStream会隐含的进行connect。
connection.connect();
DataOutputStream out = new DataOutputStream(connection
.getOutputStream());
// 正文，正文内容其实跟get的URL中 '? '后的参数字符串一致
String content = "字段名=" + URLEncoder.encode("字符串值", "编码");
// DataOutputStream.writeBytes将字符串中的16位的unicode字符以8位的字符形式写到流里面
out.writeBytes(content);
//流用完记得关
out.flush();
out.close();
//获取响应
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = reader.readLine()) != null){
System.out.println(line);
}
reader.close();
//该干的都干完了,记得把连接断了
connection.disconnect();
}
(5)java调用post接口扩展阅读：
关于Java HttpURLConnection使用
public static String sendPostValidate(String serviceUrl, String postData, String userName, String password){
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
log.info("POST接口地址:"+serviceUrl);
URL realUrl = new URL(serviceUrl);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
HttpURLConnection httpUrlConnection = (HttpURLConnection) conn;
// 设置通用的请求属性
httpUrlConnection.setRequestProperty("accept","*/*");
httpUrlConnection.setRequestProperty("connection", "Keep-Alive");
httpUrlConnection.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
httpUrlConnection.setRequestMethod("POST");
httpUrlConnection.setRequestProperty("Content-Type","application/json;charset=UTF-8");
Base64 base64 = new Base64();
String encoded = base64.encodeToString(new String(userName+ ":" +password).getBytes());
httpUrlConnection.setRequestProperty("Authorization", "Basic "+encoded);
// 发送POST请求必须设置如下两行
httpUrlConnection.setDoOutput(true);
httpUrlConnection.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(new OutputStreamWriter(httpUrlConnection.getOutputStream(),"utf-8"));
// 发送请求参数
out.print(postData);
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(httpUrlConnection.getInputStream(),"utf-8"));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
//
// if (!"".equals(result)) {
// BASE64Decoder decoder = new BASE64Decoder();
// try {
// byte[] b = decoder.decodeBuffer(result);
// result = new String(b, "utf-8");
// } catch (Exception e) {
// e.printStackTrace();
// }
// }
return result;
} catch (Exception e) {
log.info("调用异常",e);
throw new RuntimeException(e);
}
//使用finally块来关闭输出流、输入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}
catch(IOException e){
log.info("关闭流异常",e);
}
}
}
}
6. java http post 怎么设置 raw格式
调试微信推广支持中二维码生成api的接口，使用chrome浏览器的postman插件，post请求时有一个选项是form-data，或者raw，使用raw可以请求成功，from-data不知道怎么组装key和value所以一直失败。非常不明白raw是什么意思，google网络都没有相关的解释。后来研究发现，其实raw方式使用的是纯字符串的数据上传方式，所以在POST之前，可能需要手工的把一些json/text/xml格式的数据转换成字符串，是一种post原始请求，区别于form-data这种常用的key-value方式。
public static String result; public static void httpTest() throws ClientProtocolException, IOException { String token = "XRhjxAJZG3rFlPLg"; String url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=" + token; String json = "{"action_name":"QR_LIMIT_SCENE","action_info":{"scene":{"scene_id":234}}}"; HttpClient httpClient = new DefaultHttpClient(); HttpPost post = new HttpPost(url); StringEntity postingString = new StringEntity(json);// json传递 post.setEntity(postingString); post.setHeader("Content-type", "application/json"); HttpResponse response = httpClient.execute(post); String content = EntityUtils.toString(response.getEntity()); // Log.i("test",content); System.out.println(content); result = content; }
以上代码中需要导入
import org.apache.http.HttpResponse; 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;
Android中自带org.apache.http相关库文件，所以可以快捷键(ctrl+shift+o)一次导入成功。