这篇文章主要讲解了java如何模拟发送form-data的请求，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。

我就废话不多说了，大家还是直接看代码吧！

package com.silot.test; import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.mime.HttpMultipartMode;import org.apache.http.entity.mime.MultipartEntity;import org.apache.http.entity.mime.content.StringBody;import org.apache.http.impl.client.DefaultHttpClient; import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.nio.charset.Charset; public class TestCli{ public static void main(String args[]) throws Exception { MultipartEntity multipartEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE, "------------------------------0ea3fcae38ff", Charset.defaultCharset()); multipartEntity.addPart("skey", new StringBody("哈哈哈哈哈", Charset.forName("UTF-8"))); multipartEntity.addPart("operator", new StringBody("啦啦啦啦", Charset.forName("UTF-8"))); multipartEntity.addPart("VrfKey", new StringBody("渣渣渣", Charset.forName("UTF-8"))); multipartEntity.addPart("StatCode", new StringBody("00", Charset.forName("UTF-8"))); multipartEntity.addPart("mass_id", new StringBody("1234", Charset.forName("UTF-8"))); multipartEntity.addPart("reference_id", new StringBody("21231544", Charset.forName("UTF-8"))); HttpPost request = new HttpPost("http://xiefei.s1.natapp.cc/v1/withdrawCallback"); request.setEntity(multipartEntity); request.addHeader("Content-Type", "Content-Disposition: form-data; boundary=------------------------------0ea3fcae38ff"); DefaultHttpClient httpClient = new DefaultHttpClient(); HttpResponse response = httpClient.execute(request); InputStream is = response.getEntity().getContent(); BufferedReader in = new BufferedReader(new InputStreamReader(is)); StringBuffer buffer = new StringBuffer(); String line = ""; while ((line = in.readLine()) != null) { buffer.append(line); } System.out.println("发送消息收到的返回：" + buffer.toString()); }}

补充知识：java模拟复杂表单post请求

java模拟复杂表单post请求

能支持文件上传

/** * 支持复杂表单，比如文件上传 * @param formParam * @return * @throws Exception */public static String postWithForm(FormParam formParam) throws Exception {String url = formParam.getUrl();String charset = "UTF-8";String boundary = Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.String CRLF = "\r\n"; // Line separator required by multipart/form-data.URLConnection connection = new URL(url).openConnection();connection.setDoOutput(true);connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);try (OutputStream output = connection.getOutputStream();PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);) {// make body paramMap<String, String> bodyParam = formParam.getBodyParam();if (null != bodyParam) {for (String p : bodyParam.keySet()) {writer.append("--" + boundary).append(CRLF);writer.append("Content-Disposition: form-data; name=\"" + p + "\"").append(CRLF);writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF);writer.append(CRLF).append(bodyParam.get(p)).append(CRLF).flush();}}// Send file.Map<String, File> fileParam = formParam.getFileParam();if (null != fileParam) {for (String fileName : fileParam.keySet()) {writer.append("--" + boundary).append(CRLF);writer.append("Content-Disposition: form-data; name=\"" + fileName + "\"; filename=\""+ fileParam.get(fileName).getName() + "\"").append(CRLF);writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(fileName)).append(CRLF);writer.append("Content-Transfer-Encoding: binary").append(CRLF);writer.append(CRLF).flush();Files.copy(fileParam.get(fileName).toPath(), output);output.flush(); // Important before continuing with writer!writer.append(CRLF).flush(); // CRLF is important! It indicates end of boundary.}}// End of multipart/form-data.writer.append("--" + boundary + "--").append(CRLF).flush();}HttpURLConnection conn = (HttpURLConnection) connection;ByteArrayOutputStream bout = new ByteArrayOutputStream();int len;byte[] buffer = new byte[1024];while ((len = conn.getInputStream().read(buffer)) != -1) {bout.write(buffer, 0, len);}String result = new String(bout.toByteArray(), "utf-8");return result;}

FormParam封装类:

package net.riking.core.utils;import java.io.File;import java.util.Map;public class FormParam {private String url;//private String auth;///**// * http请求头里的参数// *///private Map<String, String> headerParam;/** * 常规参数 */private Map<String, String> bodyParam;/** * 待上传的文件参数 filename和file */private Map<String, File> fileParam;public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}//public String getAuth() {//return auth;//}////public void setAuth(String auth) {//this.auth = auth;//}////public Map<String, String> getHeaderParam() {//return headerParam;//}////public void setHeaderParam(Map<String, String> headerParam) {//this.headerParam = headerParam;//}public Map<String, String> getBodyParam() {return bodyParam;}public void setBodyParam(Map<String, String> bodyParam) {this.bodyParam = bodyParam;}public Map<String, File> getFileParam() {return fileParam;}public void setFileParam(Map<String, File> fileParam) {this.fileParam = fileParam;}}

看完上述内容，是不是对java如何模拟发送form-data的请求有进一步的了解，如果还想学习更多内容，欢迎关注亿速云行业资讯频道。