Java Files类代码示例

import org.nutz.lang.Files; //导入依赖的package包/类
@At
@Ok("json")
public Map<String,String> del(@Param("id")Long id,HttpServletRequest request)
{

    Img img = imgService.fetch(id);
    if (img.getImgurl() != null && img.getImgurl().trim().length() > 2)
    {
        String webPath =  request.getSession().getServletContext().getRealPath("/");
        String appPath = webPath.substring(0,webPath.length() - 1) + "upload/";

        Files.deleteFile(new File(appPath + img.getImgurl().trim()));
    }


    int num =  imgService.delete(id);
    CacheManager.getInstance().getCache(ImgService.CACHE_NAME).removeAll();
    return Bjui.rtnMap((num > 0) ? true : false , "tab_img",false);
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
/**
 * 发送图片,上传图片接口
 * @param file
 * @param context
 * @return
 */
@At
@POST
@Filters({@By(type=CrossOriginFilter.class)})
@AdaptBy(type = UploadAdaptor.class, args = { "${app.root}/WEB-INF/tmp" })
public Object image(@Param("file") TempFile file,ServletContext context){
	System.out.println(file.getName());
	System.out.println(file.getMeta().getFileLocalName());
	String relpath = getDir()+"/upload/imgs/"+file.getMeta().getFileLocalName(); // 此为: D:\\apache-tomcat-8.0.36\\webapps\\upload\\tomat.png
	Files.copy(file.getFile(),new File(relpath));

	String url ="/upload/imgs/"+file.getMeta().getFileLocalName();	//eclipse默认的tomcat目录是在其缓存文件中,你要自己指定到tomcat所在目录
	//构建json数据
	Map<String,Object> data = new HashMap<String,Object>();
	data.put("code", "0");
	data.put("msg", "");
	Map<String,String> sourceUrl = new HashMap<String,String>();
	sourceUrl.put("src", url);
	data.put("data", sourceUrl);
	
	return data;
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
/**
 * 发送图片,上传图片接口
 * @param file
 * @param context
 * @return
 */
@At
@POST
@Filters({@By(type=CrossOriginFilter.class)})
@AdaptBy(type = UploadAdaptor.class, args = { "${app.root}/WEB-INF/tmp" })
public Object files(@Param("file") TempFile file,ServletContext context){
	System.out.println(file.getName());
	System.out.println(file.getMeta().getFileLocalName());
	String relpath = getDir()+"/upload/files/"+file.getMeta().getFileLocalName(); // 此为: D:\\apache-tomcat-8.0.36\\webapps\\upload\\tomat.png
	Files.copy(file.getFile(),new File(relpath));
	String url ="/upload/files/"+file.getMeta().getFileLocalName();	//eclipse默认的tomcat目录是在其缓存文件中,你要自己指定到tomcat所在目录
	//构建json数据
	Map<String,Object> data = new HashMap<String,Object>();
	data.put("code", "0");
	data.put("msg", "");
	Map<String,String> sourceUrl = new HashMap<String,String>();
	sourceUrl.put("src", url);
	data.put("data", sourceUrl);

	return data;
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
/**
 * 将一个 JAVA 对象以 JSON 的形式写到一个文件里，并且可以设定 JSON 字符串的格式化方式
 * 
 * @param f
 *            文本文件
 * @param obj
 *            JAVA 对象
 * @param format
 *            JSON 字符串格式化方式 ，若 format 为 null ，则以 JsonFormat.nice() 格式输出
 */
public static void toJsonFile(File f, Object obj, JsonFormat format) {
    Writer writer = null;
    try {
        Files.createFileIfNoExists(f);
        writer = Streams.fileOutw(f);
        Json.toJson(writer, obj, format);
        writer.append('\n');
    }
    catch (IOException e) {
        throw Lang.wrapThrow(e);
    }
    finally {
        Streams.safeClose(writer);
    }
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
public File createFile(String suffix) {
    if (size > 0 && cursor >= size)
        cursor = -1;
    long id = ++cursor;
    if (size > 0 && id >= size)
        Lang.makeThrow("Id (%d) is out of range (%d)", id, size);
    File re = Pools.getFileById(home, id, suffix);
    if (!re.exists())
        try {
            Files.createNewFile(re);
        }
        catch (IOException e) {
            throw Lang.wrapThrow(e);
        }
    return re;
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
static void doFile(File f) {
    // 处理文件名
    String fnm = f.getName()
                  .replaceAll("_projectName_", np.getProjectName())
                  .replaceAll("_mainName_", np.getMainName());

    String rph = Files.renamePath(Disks.getRelativePath(tmplHome, f), fnm);
    log.infof(" + %s", rph);

    // 创建目标文件
    File fDest = Files.getFile(projectHome, rph);
    Files.createFileIfNoExists(fDest);

    // 处理文件的内容
    Segment seg = Segments.read(f);
    String str = seg.render(ctx).toString();
    Files.write(fDest, str);
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
public void render(HttpServletRequest req, HttpServletResponse resp,
				   Object obj) throws Exception {
	String path = evalPath(req, obj);
	String args = "";
	if (path != null && path.contains("?")) { // 将参数部分分解出来
		args = path.substring(path.indexOf('?'));
		path = path.substring(0, path.indexOf('?'));
	}

	String ext = getExt();
	// 空路径，采用默认规则
	if (Strings.isBlank(path)) {
		path = Mvcs.getRequestPath(req);
		path = (path.startsWith("/") ? "" : "/")
				+ Files.renameSuffix(path, ext);
	}
	// 绝对路径 : 以 '/' 开头的路径不增加 '/WEB-INF'
	else if (path.charAt(0) == '/') {
		if (!path.toLowerCase().endsWith(ext))
			path += ext;
	}
	// 包名形式的路径
	else {
		path = path.replace('.', '/') + ext;
	}

	// 执行 Forward
	path = path + args;
	RequestDispatcher rd = req.getRequestDispatcher(path);
	if (rd == null)
		throw Lang.makeThrow("Fail to find Forward '%s'", path);
	// Do rendering
	rd.forward(req, resp);
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
public Object get(ResultSet rs, String colName) throws SQLException {
        	InputStream in = rs.getBinaryStream(colName);
        	if (in == null) {
        		return in;
        	}
        	try {
	File f = File.createTempFile("nutzdao_blob", ".tmp");
	Files.write(f, in);
	in.close();
	return new ReadOnceInputStream(f);
}
catch (IOException e) {
	throw Lang.wrapThrow(e);
}
        }
 

import org.nutz.lang.Files; //导入依赖的package包/类
public String getSubString(long pos, int length) throws SQLException {
    if (pos < 1)
        throw new SQLException("pos<1");
    pos--;
    String str = Files.read(file);
    if (pos >= length)
        throw new IllegalArgumentException("pos="+pos);
    if (pos + length >= length())
        return str.substring((int)pos);
    return str.substring((int)pos, (int)(pos + length - 1));
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
public Object get(ResultSet rs, String colName) throws SQLException {
    File f = this.createTempFile();
    Blob blob = rs.getBlob(colName);
    if (blob == null)
        return null;
    Files.write(f, blob.getBinaryStream());
    return new SimpleBlob(f);
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
/**
 * 将内存中一个图片写入目标文件
 * 
 * @param im
 *            图片对象
 * @param targetFile
 *            目标文件，根据其后缀，来决定写入何种图片格式
 */
public static void write(RenderedImage im, File targetFile) {
    try {
        ImageIO.write(im, Files.getSuffixName(targetFile), targetFile);
    }
    catch (IOException e) {
        throw Lang.wrapThrow(e);
    }
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
public SimpleFilePool(String homePath, long max) {
    if (log.isInfoEnabled()) {
        log.infof("Init simple-file-pool by: %s [%s]", homePath, max);
    }
    this.max = max;
    this.home = Files.createDirIfNoExists(homePath);
    this.current = 0;
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
public synchronized File createFile(String suffix) {
    File f = _F(current++, suffix);
    if (current > max)
        current = 0;
    if (!f.exists())
        try {
            Files.createNewFile(f);
        }
        catch (IOException e) {
            throw Lang.wrapThrow(e);
        }
    return f;
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
public long getFileId(File f) {
    String nm = Files.getMajorName(f);
    try {
        return Long.parseLong(nm);
    }
    catch (NumberFormatException e) {}
    return -1;
}
 

import org.nutz.lang.Files; //导入依赖的package包/类
public synchronized File returnFile(long fId, String suffix) {
    File re = _F(fId, suffix);
    if (!re.exists())
        try {
            Files.createNewFile(re);
        }
        catch (IOException e) {
            throw Lang.wrapThrow(e);
        }
    return re;
}