add javascript support

webmagic-scripts/src/main/java/us/codecraft/webmagic/processor/JsScriptProcessor.java

+package us.codecraft.webmagic.processor;
+
+import org.apache.commons.io.IOUtils;
+import us.codecraft.webmagic.Page;
+import us.codecraft.webmagic.Site;
+import us.codecraft.webmagic.Spider;
+
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * @author code4crafter@gmail.com
+ */
+public class JsScriptProcessor implements PageProcessor{
+
+    private ScriptEngine rubyEngine;
+
+    private String defines;
+
+    private String script;
+
+    public JsScriptProcessor(String filename){
+        ScriptEngineManager manager = new ScriptEngineManager();
+        rubyEngine = manager.getEngineByName("javascript");
+        InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("js/defines.js");
+        try {
+            defines = IOUtils.toString(resourceAsStream);
+            resourceAsStream = this.getClass().getClassLoader().getResourceAsStream(filename);
+            script = IOUtils.toString(resourceAsStream);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+
+    }
+
+    @Override
+    public void process(Page page) {
+        ScriptContext context = rubyEngine.getContext();
+        context.setAttribute("page", page, ScriptContext.ENGINE_SCOPE);
+        try {
+            rubyEngine.eval(defines+script, context);
+        } catch (ScriptException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    @Override
+    public Site getSite() {
+        return Site.me();
+    }
+
+    public static void main(String[] args) {
+        Spider.create(new JsScriptProcessor("js/oschina.js")).addUrl("http://my.oschina.net/flashsword/blog").run();
+    }
+}

webmagic-scripts/src/main/java/us/codecraft/webmagic/processor/ScriptProcessor.java → webmagic-scripts/src/main/java/us/codecraft/webmagic/processor/RubyScriptProcessor.java

@@ -15,39 +15,39 @@ import java.io.InputStream;
 /**
  * @author code4crafter@gmail.com
  */
-public class ScriptProcessor implements PageProcessor{
+public class RubyScriptProcessor implements PageProcessor{
 
     private ScriptEngine rubyEngine;
 
     private String defines;
 
-    ScriptProcessor(){
+    private String script;
+
+    public RubyScriptProcessor(String filename){
         ScriptEngineManager manager = new ScriptEngineManager();
         rubyEngine = manager.getEngineByName("jruby");
         InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("ruby/defines.rb");
         try {
             defines = IOUtils.toString(resourceAsStream);
+            resourceAsStream = this.getClass().getClassLoader().getResourceAsStream(filename);
+            script = IOUtils.toString(resourceAsStream);
         } catch (IOException e) {
             e.printStackTrace();
         }
+
+
     }
 
     @Override
     public void process(Page page) {
         ScriptContext context = rubyEngine.getContext();
         context.setAttribute("page", page, ScriptContext.ENGINE_SCOPE);
-        String script;
-        try {
-            InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("ruby/oschina.rb");
         try {
-                script = IOUtils.toString(resourceAsStream);
             rubyEngine.eval(defines+script, context);
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
         } catch (ScriptException e) {
             e.printStackTrace();
         }
+
     }
 
     @Override
@@ -56,6 +56,6 @@ public class ScriptProcessor implements PageProcessor{
     }
 
     public static void main(String[] args) {
-        Spider.create(new ScriptProcessor()).addUrl("http://my.oschina.net/flashsword/blog").run();
+        Spider.create(new RubyScriptProcessor("ruby/oschina.rb")).addUrl("http://my.oschina.net/flashsword/blog").run();
     }
 }

webmagic-scripts/src/main/resources/js/defines.js

+function $(str){
+    return page.getHtml().$(str).toString();
+}
+function xpath(str){
+    return page.getHtml().xpath(str).toString();
+}
+function urls(str){
+    links = page.getHtml().links().regex(str).all();
+    page.addTargetRequests(links);
+}
\ No newline at end of file

webmagic-scripts/src/main/resources/js/oschina.js

+var result = {
+    title: $("div.BlogTitle h1"),
+    content: $("div.BlogContent")
+}
+var config = {
+    ua: '',
+    sleepTime : 20
+}
+urls("http://my\\.oschina\\.net/flashsword/blog/\\d+")
\ No newline at end of file

webmagic-scripts/src/test/java/us/codecraft/webmagic/js/TestJsCall.java

+package us.codecraft.webmagic.js;
+
+import org.junit.Test;
+
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+
+/**
+ * @author code4crafter@gmail.com
+ */
+public class TestJsCall {
+
+    @Test
+    public void test() throws ScriptException {
+        ScriptEngineManager manager = new ScriptEngineManager();
+        ScriptEngine rubyEngine = manager.getEngineByName("javascript");
+        ScriptContext context = rubyEngine.getContext();
+
+        context.setAttribute("a", "sad", ScriptContext.ENGINE_SCOPE);
+//        rubyEngine.eval("", context);
+        rubyEngine.eval("print(a)", context);
+    }
+}