first commit

src/main/java/com/peanut/common/utils/ConnUtil.java

@@ -0,0 +1,92 @@
+package com.peanut.common.utils;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
+import java.net.HttpURLConnection;
+import java.net.URLEncoder;
+
+
+public class ConnUtil {
+    /**
+     * UrlEncode， UTF-8 编码
+     *
+     * @param str
+     *            原始字符串
+     * @return
+     */
+    public static String urlEncode(String str) {
+        String result = null;
+        try {
+            result = URLEncoder.encode(str, "UTF-8");
+        } catch (UnsupportedEncodingException e) {
+            e.printStackTrace();
+        }
+        return result;
+    }
+
+    /**
+     * 从HttpURLConnection 获取返回的字符串
+     *
+     * @param conn
+     * @return
+     * @throws IOException
+     * @throws DemoException
+     */
+    public static String getResponseString(HttpURLConnection conn) throws IOException, DemoException {
+        return new String(getResponseBytes(conn));
+    }
+
+    /**
+     * 从HttpURLConnection 获取返回的bytes 注意 HttpURLConnection自身问题，
+     * 400类错误，会直接抛出异常。不能获取conn.getInputStream();
+     *
+     * @param conn
+     * @return
+     * @throws IOException
+     *             http请求错误
+     * @throws DemoException
+     *             http 的状态码不是 200
+     */
+    public static byte[] getResponseBytes(HttpURLConnection conn) throws IOException, DemoException {
+        int responseCode = conn.getResponseCode();
+        if (responseCode != 200) {
+            System.err.println("http 请求返回的状态码错误，期望200， 当前是 " + responseCode);
+            if (responseCode == 401) {
+                System.err.println("可能是appkey appSecret 填错");
+            }
+            throw new DemoException("http response code is" + responseCode);
+        }
+
+        InputStream inputStream = conn.getInputStream();
+        byte[] result = getInputStreamContent(inputStream);
+        return result;
+    }
+
+    /**
+     * 将InputStream内的内容全部读取，作为bytes返回
+     *
+     * @param is
+     * @return
+     * @throws IOException
+     * @see InputStream.read()
+     */
+    public static byte[] getInputStreamContent(InputStream is) throws IOException {
+        byte[] b = new byte[1024];
+        // 定义一个输出流存储接收到的数据
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        // 开始接收数据
+        int len = 0;
+        while (true) {
+            len = is.read(b);
+            if (len == -1) {
+                // 数据读完
+                break;
+            }
+            byteArrayOutputStream.write(b, 0, len);
+        }
+        return byteArrayOutputStream.toByteArray();
+    }
+
+}