java结合adobe工具实现在线预览PDF。完美解决

一.环境准备

• 去官网下载 adobe pdf 服务，直接傻瓜式安装

二.代码Demo

前端

获取数据
     <%
List<TRulePicInfo> picList=(List<TRulePicInfo>)request.getAttribute("picList");	
       <%for(int i=0;i<picList.size();i++){
    	   TRulePicInfo rulePicInfo=picList.get(i);
        	long id = rulePicInfo.getId();
        	String filePath=rulePicInfo.getPicPath();
        	String format = filePath.substring(filePath.lastIndexOf(".")+1);
        	String path = filePath.replaceAll("\\\\", "/");
        	request.setAttribute("format",format);
        	String titleName = rulePicInfo.getPicName();
       %>	
       <tr> 
        	<!-- <td><a target="_blank" href="[e-mail]?idArray=<%=id %>"><%=titleName %></a><br/></td> -->
        	<td>
        		<a target="_blank" href="[e-mail]?affixPath=<%=filePath%>"><%=titleName %></a>
        			<ac:if test="${format == 'pdf' || format == 'doc' ||format == 'docx' }">
        			&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
        				<a onclick="isAcrobatPluginInstall('<%=path%>')">点击预览</a>
        			</ac:if>
        			<br/>
        	</td>
        </tr>	
       <%}%>

<script type="text/javascript">
  		function forward(url){
  			window.location.href = url;
  		}
  		  		function quit(){
  			if(confirm("确定要退出系统吗？")) {
				window.location.href="loginOutAction.ces";
  			}
  		}
  		//判断是否是 IE 浏览器
  		//判断本电脑是否安装了 adobe PDF阅读器插件
		  function isAcrobatPluginInstall(path){
			//如果是firefox浏览器
			if (navigator.plugins && navigator.plugins.length) {
				for (x=0; x<navigator.plugins.length;x++) {
				if (navigator.plugins[x].name== 'Adobe Acrobat'){
						join(path);
						return true;
					}
				}
			}else if (window.ActiveXObject){//下面代码都是处理IE浏览器的情况
			  for (x=2; x<10; x++){
					try{
						oAcro=eval_r("new ActiveXObject('PDF.PdfCtrl."+x+"');");
						if (oAcro){
							join(path);
							return true;
						}
					}catch(e) {}
				}
				try{
					oAcro4=new ActiveXObject('PDF.PdfCtrl.1');
						if (oAcro4){
							join(path);
							return true;
						}
					}catch(e) {}
					try{
						oAcro7=new ActiveXObject('AcroPDF.PDF.1');
							if (oAcro7){
								join(path);
								return true;
							}
						}catch(e) {}
				 	 }
				 	 alert("检测到该电脑未安装 Adobe阅读PDF插件，无法在线查看,请安装后重试");
				 	 return;
				}
			
			//追加超链接元素，并触发
			 function join(filePath){
				 if(document.getElementById("H2") != null){
					 document.body.removeChild(document.getElementById("H2"))
					 return;
				 }
				 document.body.appendChild(document.createElement("br"));
				 var a = document.createElement("a");
				 a.id="H2";
				 a.href="[e-mail]?path="+filePath;
				 a.innerText="预览PDF";
				 document.body.appendChild(a)
				 var h2 = document.getElementById("H2");
				 document.getElementById("H2").style.display="none";
				 h2.onclick=function(){
				 }
				 h2.click();
			 }

  </script>

后台

    /**
     * 结合adobe IE 插件,支持在线打开PDF，兼容所有IE
     * @author Cc
     */
    public void pdfNowShow() throws IOException {
    	String filePath = Function.getParameter(request, "path");
        File file = new File(filePath);
        if (!file.exists()) {
            return;
        }
        BufferedInputStream br = new BufferedInputStream(new FileInputStream(file));
        byte[] bs = new byte[1024];
        int len = 0;
        response.reset(); //处理头部空白页信息
        URL u = new URL("file:///" + filePath);
        String contentType = u.openConnection().getContentType();
        response.setContentType(contentType);
        //inline 在线预览方式 
        response.setHeader("Content-Disposition", "inline;filename="+"");
        OutputStream out = response.getOutputStream();
        while ((len = br.read(bs)) > 0) {
            out.write(bs, 0, len);
        }
        out.flush();
        out.close();
        br.close();
        return;
    }

到此已经实现 adobe 实现 pdf在线预览