java远程下载图片

<script type="text/javascript">
window.NextPic=function(url,name){
    var cb = "http://localhost:8080"+url
    console.log("haha");
    var src = document.getElementById(name).src
    if(src.indexOf("rcwimg")<=0) return;
    document.getElementById(name).src = cb;
}
</script>

public class WaNewsInfoVo extends Page<WaNewsInfo>{
    
    private Integer id;
    private String title;
    private Integer typeId;
    private String typeName;
    private Integer typeId2;
    private String typeName2;
    private String logo;
    private String content;
    private String createTime;
    private String createUser;
    private String createUserName;
    private String tag1;
    private String tag2;
    private Integer isDisplay;
    private Integer browser;
    private String summary;
}

   /*** 
     * 获取ImageUrl地址 
     *  
     * @param HTML 
     * @return 
     */  
    private List<String> getImageUrl(String HTML) {  
        Matcher matcher = Pattern.compile(IMGURL_REG).matcher(HTML);  
        List<String> listImgUrl = new ArrayList<String>();  
        while (matcher.find()) {  
            listImgUrl.add(matcher.group());  
        }  
        return listImgUrl;  
    } 
    /*** 
     * 获取HTML内容 
     *  
     * @param url 
     * @return 
     * @throws Exception 
     */  
    private String getHTML(String url) throws Exception {  
        URL uri = new URL(url);  
        URLConnection connection = uri.openConnection();  
        InputStream in = connection.getInputStream();  
        byte[] buf = new byte[1024];  
        int length = 0;  
        StringBuffer sb = new StringBuffer();  
        while ((length = in.read(buf, 0, buf.length)) > 0) {  
            sb.append(new String(buf, ECODING));  
        }  
        in.close();  
        return sb.toString();  
    }  
    /*** 
     * 获取ImageSrc地址 
     *  
     * @param listImageUrl 
     * @return 
     */  
    private List<String> getImageSrc(List<String> listImageUrl) {  
        List<String> listImgSrc = new ArrayList<String>();  
        for (String image : listImageUrl) {  
            Matcher matcher = Pattern.compile(IMGSRC_REG).matcher(image);  
            while (matcher.find()) {  
                listImgSrc.add(matcher.group().substring(0, matcher.group().length() - 1));  
            }  
        }  
        return listImgSrc;  
    }  
    /*** 
     * 下载图片 
     *  
     * @param listImgSrc 
     */  
    private void Download(List<String> listImgSrc, String path) {  
        try {  
            for (String url : listImgSrc) {  
                if(url.indexOf("http")>=0){
                String imageName = url.substring(url.lastIndexOf("/") + 1, url.length());  
                URL uri = new URL(url);  
                InputStream in = uri.openStream();
                FileOutputStream fo = new FileOutputStream(new File(path,imageName));  
                byte[] buf = new byte[1024];  
                int length = 0;  
                System.out.println("开始下载:" + url);  
                while ((length = in.read(buf, 0, buf.length)) != -1) {  
                    fo.write(buf, 0, length);  
                }  
                in.close();  
                fo.close();  
                System.out.println(path+imageName + "下载完成");  
                }
            }  
        } catch (Exception e) {  
            System.out.println("下载失败");  
        }  
    }     

    /** 
     * 替换指定标签的属性和值 
     * @param str 需要处理的字符串 
     * @param tag 标签名称 
     * @param tagAttrib 要替换的标签属性值 
     * @param startTag 新标签开始标记 
     * @param endTag  新标签结束标记 
     * @return 
     * @author huweijun 
     * @date 2016年7月13日 下午7:15:32 
     */  
    public static String replaceHtmlTag(String str, String tag, String tagAttrib, String startTag, String endTag) {
        //匹配以<img开头>结尾
        String regxpForTag = "<\\s*" + tag + "\\s+([^>]*)\\s*" ;  
        //匹配src="开头，"结尾
        String regxpForTagAttrib = tagAttrib + "=\\s*\"([^\"]+)\"" ;  
        //编译后的正则表达式
        Pattern patternForTag = Pattern.compile (regxpForTag,Pattern. CASE_INSENSITIVE );  
        Pattern patternForAttrib = Pattern.compile (regxpForTagAttrib,Pattern. CASE_INSENSITIVE );
        //先查<img标签
        Matcher matcherForTag = patternForTag.matcher(str);  
        StringBuffer sb = new StringBuffer();  
        //如果有结果
        boolean result = matcherForTag.find();  
        while (result) {  
            StringBuffer sbreplace = new StringBuffer( "<"+tag+" ");  
            //查到的第一个<img,再匹配src
            Matcher matcherForAttrib = patternForAttrib.matcher(matcherForTag.group(1));  
            if (matcherForAttrib.find()) {  
                String attributeStr = matcherForAttrib.group(1);
                String imageName = attributeStr.substring(attributeStr.lastIndexOf("/") + 1, attributeStr.length());
                sbreplace.append("id=‘"+imageName+"‘ alt=‘图片‘ onerror=\"NextPic(‘/attached/image/"+imageName+"‘,‘"+imageName+"‘);\"");
                matcherForAttrib.appendReplacement(sbreplace, startTag + "rcwimg" + endTag);
            }  
            matcherForAttrib.appendTail(sbreplace);  
            matcherForTag.appendReplacement(sb, sbreplace.toString());  
            result = matcherForTag.find();  
        }  
        matcherForTag.appendTail(sb);           
        return sb.toString();  
    }