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文件上传
jsp中
<a href="/file/new.action">文件上传案例</a>
fileaction中
@Override
public String execute() throws Exception {
return SUCCESS;
}
配置xml,记得在struts.xml中导入这个xml,
<constant name="struts.multipart.maxSize" value="10485760"/>是修改默认文件上传大小限制
<struts> <package name="filePackage" extends="basePackage" namespace="/file"> <!--没有method默认调用execute--> <action name="new" class="com.kaishengit.action.FileAction"> <result>/WEB-INF/views/file/upload.jsp</result> </action> <action name="upload" class="com.kaishengit.action.FileAction" method="upload"> <result type="redirectAction"> <param name="actionName">new</param> <param name="namespace">/file</param> </result> </action> <action name="download" class="com.kaishengit.action.FileAction" method="download"> <result type="stream"> <param name="contentType">${downloadType}</param> <!-- <param name="contentLength"></param> --> <param name="contentDisposition">attachment;filename="${downloadName}"</param> <param name="inputName">downloadFile</param> <param name="bufferSize">2048</param> <param name="allowCaching">true</param> <param name="contentCharSet">UTF-8</param> </result> </action> </package> </struts>
跳转到/WEB-INF/views/file/upload.jsp这个jsp中的form表单
action中即使没有doget和dopost方式也要写post提交,但在搜索的时候的form表单中是用get提交
文件上传的时候必须要写enctype="multipart/form-data" 否则用strut2会报错说没有什么input视图
要切记
<form action="/file/upload.action" method="post" enctype="multipart/form-data"> <input type="text" name="title"> <input type="file" name="pic"> <input type="file" name="pic"> <input type="file" name="pic"> <button>保存</button> </form>
通过配置项来到upload方法中
public String upload() { /*private File pic;等 记得生成get和set */ //System.out.println("Title:" + title); //这个时候获得的是上传缓存的名字,看不懂 //System.out.println("file:" + pic.getName()); /*这里才是获得文件名字,是使用了约定 private String picFileName 表单file名字+FileName;生成get set*/ //System.out.println("file:" + picFileName); /*这里才是获得文件类型,是使用了约定 private String picContentType 表单file名字+ContentType;生成get set*/ //System.out.println("type:" + picContentType); try { //单文件上传 IOUtils.copy(new FileInputStream(pic), new FileOutputStream(new File("C:/upload",fileName))); /*多文件上传时 <input type="file" name="pic"> <input type="file" name="pic"> <input type="file" name="pic"> 用数组或者集合的形式接收 private List<File> pic; private List<String> picFileName; private List<String> picContentType;*/ for(int i = 0;i < pic.size();i++) { File file = pic.get(i); String fileName = picFileName.get(i); IOUtils.copy(new FileInputStream(file), new FileOutputStream(new File("C:/upload",fileName))); } } catch (Exception e) { e.printStackTrace(); } return SUCCESS; }
文件下载
方法一:
jsp中
<a href="/file/download.action">下载文件</a>
Fileaction中 获取response
public String download(){ HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType("application/pdf"); OutputStream out = response.getOutputStream(); InputStream in = new FileInputStream(new File("c:/xx.pdf")); IOUtils.copy(in,out); out.flush(); out.close(); in.close(); return NONE; }
可以写在basicAction中,不用每次都写一遍,然后在Fileaction中传入路径即可
public void downloadFile(String filePath) throws Exception{ HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType("application/pdf"); OutputStream out = response.getOutputStream(); InputStream in = new FileInputStream(new File(filePath)); IOUtils.copy(in,out); out.flush(); out.close(); in.close(); }
但是我们下载的格式不是固定的,可以定义一个map集合,根据后缀名判断
在basicAction中
public static Map<String,String> mimeType = new HashMap<String, String>(); static { mimeType.put(".pdf", "application/pdf"); mimeType.put(".json", "application/json"); mimeType.put(".doc","application/msword"); mimeType.put(".jpg","image/jpeg"); mimeType.put(".jpeg","image/jpeg"); mimeType.put(".jpe","image/jpeg"); mimeType.put(".xls","application/vnd.ms-excel"); mimeType.put(".zip","application/zip"); mimeType.put(".wps","application/vnd.ms-works"); mimeType.put(".gif","image/gif"); mimeType.put(".mp3","audio/mpeg"); //application/octet-stream } public void downloadFile(String filePath,String downloadFileName) throws Exception{ HttpServletResponse response = getResponse(); downloadFileName = new String(downloadFileName.getBytes("UTF-8"),"ISO8859-1"); // 设置下载文件的名字 response.addHeader("contentDisposition", "attachment;filename=\""+downloadFileName+"\""); String fileType = filePath.substring(filePath.lastIndexOf(".")); if(mimeType.containsKey(fileType)) { response.setContentType(mimeType.get(fileType)); } else { //没有的话就认为是2进制 response.setContentType("application/octet-stream"); } OutputStream out = response.getOutputStream(); InputStream in = new FileInputStream(new File(filePath)); IOUtils.copy(in, out); out.flush(); out.close(); in.close(); }
方法二
Fileaction中
public String download() throws Exception { downloadType = "application/pdf"; downloadName = new String("缓存.pdf".getBytes("UTF-8"),"ISO8859-1"); //return了一个success.需要在xml中配置一个返回值是stream return SUCCESS; } public InputStream getDownloadFile() throws Exception { return new FileInputStream("C:/upload/065-cache.pdf"); }
struts-file.xml中
<action name="download" class="com.kaishengit.action.FileAction" method="download"> <result type="stream"> <param name="contentType">${downloadType}</param> <!-- 进度条 <param name="contentLength"></param> --> <!--下载框--><param name="contentDisposition">attachment;filename="${downloadName}"</param> <!--给一个输入流,需要在FileAction中配置一个方法获取输入流,返回值是InputStream 方法名为get开头,param里面的参数为去掉get后首字母小写的结果--> <param name="inputName">downloadFile</param> <param name="bufferSize">2048</param> <param name="allowCaching">true</param> <param name="contentCharSet">UTF-8</param> </result> </action>
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这里再讲一个struts中常用的返回形式json
方法1:使用常用的返回方式返回json,首先在pom里添加对gson的导入
public class JSONAction extends BasicAction{ private static final long serialVersionUID = 1L; @Override public String execute() throws Exception { /*在basic中提供renderJSON public void renderJSON(Object obj) throws Exception { HttpServletResponse response = getResponse(); response.setContentType("application/json;charset=UTF-8"); Gson gson = new Gson(); String json = gson.toJson(obj); PrintWriter out = response.getWriter(); out.print(json); out.flush(); out.close(); } */ Map<String, Object> map = new HashMap<String, Object>(); map.put("state", "success"); map.put("result", "OK"); renderJSON(map); return NONE; } }
struts-json中 要继承json-default
<package name="jsonPackage" extends="basePackage,json-default" namespace="/json"> <action name="product" class="com.kaishengit.action.JSONAction"> </action> </package>
方法2:使用插件返回
导入struts-json-plugin,必须和struts-core的版本一致
public class JSONAction extends BasicAction{ private static final long serialVersionUID = 1L; private Map<String, Object> map; @Override public String execute() throws Exception { map = new HashMap<String, Object>(); map.put("id", 1001); map.put("name", "Jerry"); map.put("address", "中国河南省"); return SUCCESS; } //get set public Map<String, Object> getMap() { return map; } public void setMap(Map<String, Object> map) { this.map = map; } }
struts-json中
extends="basePackage,json-default"多继承
<package name="jsonPackage" extends="basePackage,json-default" namespace="/json"> <action name="product" class="com.kaishengit.action.JSONAction"> <!--插件中定义了新的返回值json--> <result name="success" type="json"> <!--root默认是一个action,会把里面所有的属性都转换成json-- 修改成map后只转化里面的map--> <param name="root">map</param> <param name="enableGZIP">true</param>压缩,传输快 <param name="noCache">true</param>不缓存 <param name="excludeNullProperties">true</param>排除没有值的属性,不生成json <param name="contentType">application/JSON</param> <param name="encoding">UTF-8</param> </result> </action> </package>
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原文地址：http://www.cnblogs.com/itliucheng/p/4462144.html
