JavaFX的webview下载文件的一种实现思路

首先网上找不到webview的下载的demo，资料也很少，毕竟java不擅长桌面客户端所以资料比较少，所以这里就自己找了一下思路，实现了一下，有需要的可以参考一下；
或者推荐另外一个内嵌浏览器jbrowers，听说不错，不过要付费的，可以找破解版；

内嵌webview效果图：

webview下载图片：

webview下载的存放目录：

首先遇到的几个问题：
安全 ID 结构无效。
解决：这个是WpSystem这个目录是系统目录，所以报错了，自己新建个目录就可以了；

拒绝访问：

解决：这个问题一般是目录有问题或者语法调用有问题

简单的代码demo，不是最优的写法（存在很大优化空间），只是一个思路，具体优化就看自己的；

```java
package com.javafx;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Worker;
import javafx.concurrent.Worker.State;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.web.PopupFeatures;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebEvent;
import javafx.scene.web.WebView;
import javafx.util.Callback;

public class Controller implements Initializable {

	Executor excutor=Executors.newFixedThreadPool(3);
	private boolean maybeCheckNeedDownLoad = false;

	@FXML
	private WebView webView;

	@Override
	public void initialize(URL location, ResourceBundle resources) {
		// TODO Auto-generated method stub

		final WebEngine webengine = webView.getEngine();
		// String url =
		// Main.class.getResource("/html/index.html").toExternalForm();
		webengine.getLoadWorker().stateProperty()
				.addListener(new ChangeListener<State>() {
					@Override
					public void changed(ObservableValue ov, State oldState,
							State newState) {
					
						if (newState == Worker.State.SUCCEEDED) {
							System.out.println("SUCCEEDED");
							System.out.println(webengine.getLocation());
						} else if (newState == Worker.State.SCHEDULED) {
							System.out.println("SCHEDULED");
							System.out.println(webengine.getLocation());
							if (maybeCheckNeedDownLoad)
								check(webengine.getLocation());
						} else if (newState == Worker.State.CANCELLED) {
							System.out.println("CANCELLED");
							System.out.println(webengine.getLocation());
						}

					}
				});
		
		webengine
				.setOnAlert((WebEvent<String> wEvent) -> {
					System.out.println("Alert Event  -  Message:  "
							+ wEvent.getData());
				});

		webengine.setOnVisibilityChanged((WebEvent<Boolean> wEvent) -> {
			System.out.println("Alert Event  -  Message:  "
					+ wEvent.getData());
		});
		webengine.setOnError((wEvent) -> {
			System.out.println("Alert Event  -  Message:  "
					+ wEvent.getMessage()+"=="+wEvent.getException().toString());
		});
		webengine.setOnStatusChanged((WebEvent<String> wEvent) -> {
		
			/* System.out.println(wEvent.getSource());
			 System.out.println(wEvent.getData());
			 System.out.println(wEvent.getEventType());*/
			 
		});
		webengine
				.setCreatePopupHandler(new Callback<PopupFeatures, WebEngine>() {
					@Override
					public WebEngine call(PopupFeatures config) {
						// do something
						// return a web engine for the new browser window

						String url = webengine.getLocation();
						System.out.println("PopupFeatures" + url);
						maybeCheckNeedDownLoad = true;
						return webengine;
					}
				});

		//webengine.load("http://xiazai.zol.com.cn/down.php?softid=428055&subcateid=1443&site=10&checkStr=b59ee0b66cc7aae39&pos=dxgs2&rand=78ae0");
		 webengine.load("http://baidu.com/");
		 //webengine.load("http://local.dg.console.com:8081");
	
		// webengine.load("http://local.dg.console.com:8081/api/export/exportStoreList?paramStr=%7B%22pageIndex%22:0,%22pageSize%22:0,%22conditions%22:%5B%7B%22type%22:%22simple%22,%22field%22:%22t.status%22,%22comparison%22:%22Eq%22,%22value%22:%22%22%7D,%7B%22type%22:%22keyword%22,%22field%22:%22t.store_name,t.boss_name%22,%22comparison%22:%22Like%22,%22value%22:%22%22%7D,%7B%22field%22:%22t.create_time%22,%22dateRange%22:%22UNLIMITED%22,%22type%22:%22dateRange%22,%22startDate%22:%22%22,%22endDate%22:%22%22%7D,%7B%22type%22:%22simple%22,%22field%22:%22t.state%22,%22comparison%22:%22Eq%22,%22value%22:%22%22%7D,%7B%22type%22:%22keyword%22,%22field%22:%22t.invite_phone%22,%22comparison%22:%22Like%22,%22value%22:%22%22%7D%5D,%22orders%22:%5B%7B%22field%22:%22t.create_time%22,%22direction%22:%22Desc%22%7D%5D,%22areaCode%22:%22%22,%22areaLevel%22:%22%22,%22paging%22:false%7D");
	}

	private void check(String url) {
		maybeCheckNeedDownLoad = false;
		System.out.println(url);
		URL urlobj;

		try {
			urlobj = new URL(url);
			HttpURLConnection urlconnection;
			urlconnection = (HttpURLConnection) urlobj.openConnection();
			urlconnection.setRequestMethod("GET");
			urlconnection.connect();
			Map headers = urlconnection.getHeaderFields();
			Object connect_content = headers.get("Content-Disposition");
			if (connect_content == null) {
				connect_content = headers.get("content-disposition");
			}
			if (connect_content instanceof Collection) {
				List<String> aa = (List<String>) connect_content;
				String bb = aa.get(0);
				System.out.println(bb);
				if (bb.contains("attachment;")) {
					excutor.execute(()->{
						String kv[] = bb.split("filename=");
						String filename= kv[kv.length - 1].replaceAll("\"","");
						System.out.println("需要下载:" +filename);
						saveFile(url,"E:\\test\\"+filename);
					});
					
				}
			}

		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		return;
	}

	private void saveFile(String url,String saveFilePathTarget) {
		URL uurl;
		try {
			uurl = new URL(url);
			HttpURLConnection urlconnection=(HttpURLConnection) uurl.openConnection();
			urlconnection.setRequestMethod("GET");//或者POST
			File saveFile=new File(saveFilePathTarget);
			urlconnection.connect();
			if(!saveFile.exists()){
				System.out.println("不存在");
				//saveFile.mkdirs();
			}
			
			InputStream inputstream=urlconnection.getInputStream();
		
			OutputStream out = new FileOutputStream(saveFile);
            int size = 0;
            int len = 0;
            byte[] buf = new byte[1024];
            while ((size = inputstream.read(buf)) != -1) {
                len += size;
                out.write(buf, 0, size);
           
            }
            inputstream.close();
            out.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
			
			
	}
}

总结：
1、这里因为是demo代码只要是提一下实现思路，实现功能为主，其他的优化自己优化：
a、webview的弹出窗口事件的监听；
b、webview判断url的类型是否是下载文件的响应；
c、是的话就下载；
目前测试的代码是标签的点击实现的下载，不支持window.open("下载url")的js事件；目前没去找原因是不是不识别window.open（）方法，如果有知道的或者直接如何解决window.open（）的可以通知一下本人，本人记录一下实现方案；