Java 后台访问别的项目API,上传文件实现
简述
跨系统API访问操作:A系统上传附件,现需要将A系统上传的附件同时上传到B系统,B系统有对应的页面操作实现。要求:不需要经过B系统页面,直接A系统后台上传附件到B系统对应目录下,故想到一个解决方案就是,A系统后台直接访问B系统的现有的上传文件的后台API。
**注意:**1、此处是http POST
2、每个添加的参数要和API匹配哦!
代码
public static String sendPostWithFile() {
String url = "http://XXXXX/ImportFile"
DataOutputStream out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
String BOUNDARY = "------------1qazxsw23dedc"; // 定义数据分隔线
conn.setUseCaches(false);
conn.setRequestMethod("POST"); // 注意这里的“POST”要大写哦~
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0(compatitble;MSIE 6.0; Windows NT 5.1; SV1");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
conn.connect();
out = new DataOutputStream(conn.getOutputStream());
byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes(); // 定义最后数据分隔
// 添加参数areaFlag
StringBuilder sb2 = new StringBuilder();
sb2.append("--");
sb2.append(BOUNDARY);
sb2.append("\r\n");
sb2.append("Content-Disposition: form-data;name=\"areaFlag\"");
sb2.append("\r\n");
sb2.append("\r\n");
sb2.append("All");
sb2.append("\r\n");
out.write(sb1.toString().getBytes());
// 添加参数file
File file = new File("D:/4513420347.pdf");
StringBuilder sb = new StringBuilder();
sb.append("--");
sb.append(BOUNDARY);
sb.append("\r\n");
sb.append("Content-Disposition: form-data;name=\"productFile\";filename=\"" + file.getName()+"\"");// name=后面接的B系统后台接参的名称,注意根据具体情况修改哦
sb.append("\r\n");
sb.append("Content-Type:application/octet-stream");
sb.append("\r\n");
sb.append("\r\n");
out.write(sb.toString().getBytes());
DataInputStream in1 = new DataInputStream(new FileInputStream(file));
int bytes = 0;
byte[] bufferOut = new byte[1024];
while ((bytes = in1.read(bufferOut)) != -1) {
out.write(bufferOut, 0, bytes);
}
out.write("\r\n".getBytes()); // 多个文件时,两个文件之间加这个
in1.close();
out.write(end_data);
out.flush();
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.print("发送POST请求出现异常!" + e);
e.printStackTrace();
}
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}