增加HttpRequestBody

webmagic-core/src/main/java/us/codecraft/webmagic/model/HttpRequestBody.java

+package us.codecraft.webmagic.model;
+
+import org.apache.http.NameValuePair;
+import org.apache.http.client.utils.URLEncodedUtils;
+import org.apache.http.message.BasicNameValuePair;
+
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author code4crafter@gmail.com
+ *         Date: 17/4/8
+ */
+public class HttpRequestBody {
+
+    public static abstract class ContentType {
+
+        public static final String JSON = "application/json";
+
+        public static final String XML = "text/xml";
+
+        public static final String FORM = "application/x-www-form-urlencoded";
+
+        public static final String MULTIPART = "multipart/form-data";
+    }
+
+    private final byte[] body;
+
+    private final String contentType;
+
+    private final String encoding;
+
+    public HttpRequestBody(byte[] body, String contentType, String encoding) {
+        this.body = body;
+        this.contentType = contentType;
+        this.encoding = encoding;
+    }
+
+    public String getContentType() {
+        return contentType;
+    }
+
+    public String getEncoding() {
+        return encoding;
+    }
+
+    public static HttpRequestBody json(String json, String encoding) throws UnsupportedEncodingException {
+        return new HttpRequestBody(json.getBytes(encoding), ContentType.JSON, encoding);
+    }
+
+    public static HttpRequestBody xml(String xml, String encoding) throws UnsupportedEncodingException {
+        return new HttpRequestBody(xml.getBytes(encoding), ContentType.XML, encoding);
+    }
+
+    public static HttpRequestBody custom(byte[] body, String contentType, String encoding) throws UnsupportedEncodingException {
+        return new HttpRequestBody(body, contentType, encoding);
+    }
+
+    public static HttpRequestBody form(Map<String,Object> params, String encoding) throws UnsupportedEncodingException {
+        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(params.size());
+        for (Map.Entry<String, Object> entry : params.entrySet()) {
+            nameValuePairs.add(new BasicNameValuePair(entry.getKey(), String.valueOf(entry.getValue())));
+        }
+        return new HttpRequestBody(URLEncodedUtils.format(nameValuePairs, encoding).getBytes(encoding), ContentType.FORM, encoding);
+    }
+
+}