Java代码访问Servlet并返回_servlet调用java类-优快云博客

本文链接：https://blog.youkuaiyun.com/S_First/article/details/78659298

本文提供了一个使用Java代码向Servlet发送请求的示例。通过创建URL对象并打开连接，设置远程写权限，将参数编码后发送，并接收响应信息。

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Java代码访问Servlet代码如下：

public static String test(String url, Map data)

throws Exception {

//创建URL对象

URL url = new URL(url);

//打开连接获取连接对象

URLConnection connection = url.openConnection();

//能够进行远程写操作

connection.setDoOutput(true);
//把参数拼接到URL后面
try (PrintWriter out = new PrintWriter(connection.getOutputStream())) {

for (Object obj : data.entrySet()) {

out.print('&');

Map.Entry<String, String> entry = (Map.Entry<String, String>) obj;
String key = entry.getKey().toString();
String value = null;
if (entry.getValue() == null) {
value = "";
} else {
value = entry.getValue().toString();
}
out.print(key);
out.print('=');
out.print(URLEncoder.encode(value, "UTF-8"));
}
}
//接收返回响应信息
StringBuilder response = new StringBuilder();
try (Scanner in = new Scanner(connection.getInputStream())) {
while (in.hasNextLine()) {
response.append(in.nextLine());
response.append("\n");
}
} catch (Exception e) {
e.printstacktrace()

}

return response.toString();

}