1.请求参数为json格式

1.pom.xml文件

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>tcl.java</groupId> <artifactId>test</artifactId> <version>1.0-SNAPSHOT</version> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <mainClass>hello.helloword</mainClass> </configuration> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.5</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.51</version> </dependency> </dependencies> </project>

2.代码

package hello; import com.alibaba.fastjson.JSONObject; import org.apache.http.HttpEntity; import org.apache.http.ParseException; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicHeader; import org.apache.http.protocol.HTTP; import org.apache.http.util.EntityUtils; import java.io.IOException; import java.util.HashMap; public class JsonPost { /** * 发送post请求 * @param url 路径 * @param jsonObject 参数(json类型) * @param encoding 编码格式 * @return * @throws ParseException * @throws IOException */ public static String send(String url, JSONObject jsonObject, String encoding) throws ParseException, IOException { String body = ""; //创建httpclient对象 CloseableHttpClient client = HttpClients.createDefault(); //创建post方式请求对象 HttpPost httpPost = new HttpPost(url); //装填参数 StringEntity s = new StringEntity(jsonObject.toString(), "utf-8"); s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json")); //设置参数到请求对象中 httpPost.setEntity(s); // System.out.println("请求地址："+url); // System.out.println("请求参数："+nvps.toString()); //设置header信息 //指定报文头【Content-type】、【User-Agent】 // httpPost.setHeader("Content-type", "application/x-www-form-urlencoded"); httpPost.setHeader("Content-type", "application/json"); httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"); //执行请求操作，并拿到结果（同步阻塞） CloseableHttpResponse response = client.execute(httpPost); //获取结果实体 HttpEntity entity = response.getEntity(); if (entity != null) { //按指定编码转换结果实体为String类型 body = EntityUtils.toString(entity, encoding); } EntityUtils.consume(entity); //释放链接 response.close(); return body; } public static void main(String[] args) throws IOException { // 将post请求参数写到map中（map中可以存map） HashMap<String, String> params = new HashMap<>(); params.put("date", "20200630"); params.put("typeId", "dsafa"); HashMap<String, Object> map = new HashMap<>(); map.put("key", "42423=q8"); map.put("id", "42342352"); map.put("pageNum", "0"); map.put("pageSize", "1000"); map.put("params", params); // 将map转为json对象 JSONObject json = new JSONObject(map); String url = "http://dc-o.web.leiniao.com/operation/open/request"; System.out.println(send(url, json, "UTF-8")); } }

2.请求参数为form-data格式

1.pom.xml文件

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>tcl.java</groupId> <artifactId>test</artifactId> <version>1.0-SNAPSHOT</version> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <mainClass>hello.helloword</mainClass> </configuration> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.5</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.51</version> </dependency> </dependencies> </project>

2.代码

package hello; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.HttpURLConnection; import java.net.URL; import java.util.HashMap; import java.util.Map; public class FormatPost { /** * 使用POST格式发送form-data格式参数，并获取响应字符串 * @param path * @param params * @return */ public static String sendSmsFormByPost(String path, Map<String ,Object> params){ URL u = null; HttpURLConnection con = null; // 构建请求参数 StringBuffer sb = new StringBuffer(); if (params != null) { for (Map.Entry<String, Object> e : params.entrySet()) { sb.append(e.getKey()); sb.append("="); sb.append(e.getValue()); sb.append("&"); } //去掉最后一个& sb.substring(0, sb.length() - 1); } // 尝试发送请求 try { u = new URL(path); con = (HttpURLConnection) u.openConnection(); POST 只能为大写，严格限制，post会不识别 con.setRequestMethod("POST"); con.setDoOutput(true); con.setDoInput(true); con.setUseCaches(false); con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); OutputStreamWriter osw = new OutputStreamWriter(con.getOutputStream(), "UTF-8"); osw.write(sb.toString()); osw.flush(); osw.close(); } catch (Exception e) { e.printStackTrace(); } finally { if (con != null) { con.disconnect(); } } // 读取返回内容 StringBuffer buffer = new StringBuffer(); try { //一定要有返回值，否则无法把请求发送给server端。 BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8")); String temp; while ((temp = br.readLine()) != null) { buffer.append(temp); buffer.append("\n"); } } catch (Exception e) { e.printStackTrace(); } return buffer.toString(); } public static void main(String[] args) throws IOException { // 将post请求参数写到map中 HashMap<String, Object> map = new HashMap<>(); map.put("key", "rwrwffcs"); map.put("id", "424252"); map.put("pageNum", "0"); map.put("pageSize", "1000"); map.put("params", "aaa"); String url = "http://dc-o.web.leiniao.com/operation/open/request"; System.out.println(sendSmsFormByPost(url, map)); } }