3. 对 UEditor 文件上传的源码的理解

这里以上传图片为例

先决条件
- 你已经看完了上一篇 : ueditor 之 holleworld，因为我是使用上一篇的开发环境
- 你已经知道如何搭建 ueditor 的 helloworld
问题
1. ueditor 上传图片的过程不受我们控制，编辑过程产生的垃圾（例如：用户上传后没有使用的图片）不知如何清理？
2. 上传图片只能保存在本服务器上（继承上一篇的开发环境：也就本 tomcat 上），使得我们无法为本项目配置单独一台图片服务器进行开发、生产（服务器集群）
寻找后端入口：

（com.baidu.ueditor.ActionEnter）

查看 ueditor.config.js
下载 ueditor 源码

ueditor官网下载链接
删除 ueditor jar包

引入源码

几个比较重要的类(突然然发现这些名字都起的好好，见名知义)：

ActionEnter.java
后台入口，调用 CongigManager 加载 jsp/config.json 的配置信息，根据不同请求执行不同的逻辑代码

构造方法，初始化的时候利用 CongigManager 加载 jsp/config.json 的数据

        public ActionEnter ( HttpServletRequest request, String rootPath ) {
        this.request = request;
        this.rootPath = rootPath;
        this.actionType = request.getParameter( "action" );
        this.contextPath = request.getContextPath();
        this.configManager = ConfigManager.getInstance( this.rootPath, this.contextPath, request.getRequestURI() );
        
    }

根据不同请求执行不同的逻辑代码

        public String invoke() {
    
    if ( actionType == null || !ActionMap.mapping.containsKey( actionType ) ) {
        return new BaseState( false, AppInfo.INVALID_ACTION ).toJSONString();
    }
    
    if ( this.configManager == null || !this.configManager.valid() ) {
        return new BaseState( false, AppInfo.CONFIG_ERROR ).toJSONString();
    }
    
    State state = null;
    
    int actionCode = ActionMap.getType( this.actionType );
    
    Map<String, Object> conf = null;
    
    switch ( actionCode ) {
    
        case ActionMap.CONFIG:
            return this.configManager.getAllConfig().toString();
            
        case ActionMap.UPLOAD_IMAGE:
        case ActionMap.UPLOAD_SCRAWL:
        case ActionMap.UPLOAD_VIDEO:
        case ActionMap.UPLOAD_FILE:
            conf = this.configManager.getConfig( actionCode );
            state = new Uploader( request, conf ).doExec();
            break;
            
        case ActionMap.CATCH_IMAGE:
            conf = configManager.getConfig( actionCode );
            String[] list = this.request.getParameterValues( (String)conf.get( "fieldName" ) );
            state = new ImageHunter( conf ).capture( list );
            break;
            
        case ActionMap.LIST_IMAGE:
        case ActionMap.LIST_FILE:
            conf = configManager.getConfig( actionCode );
            int start = this.getStartIndex();
            state = new FileManager( conf ).listFile( start );
            break;
            
    }
    
    return state.toJSONString();
    
}

ConfigManager.java

配置管理器 : 看下面代码对比一下 jsp/config.json 就知道了


    public Map<String, Object> getConfig ( int type ) {
    
    Map<String, Object> conf = new HashMap<String, Object>();
    String savePath = null;
    
    switch ( type ) {
    
        case ActionMap.UPLOAD_FILE:
            conf.put( "isBase64", "false" );
            conf.put( "maxSize", this.jsonConfig.getLong( "fileMaxSize" ) );
            conf.put( "allowFiles", this.getArray( "fileAllowFiles" ) );
            conf.put( "fieldName", this.jsonConfig.getString( "fileFieldName" ) );
            savePath = this.jsonConfig.getString( "filePathFormat" );
            break;
            
        case ActionMap.UPLOAD_IMAGE:
            conf.put( "isBase64", "false" );
            conf.put( "maxSize", this.jsonConfig.getLong( "imageMaxSize" ) );
            conf.put( "allowFiles", this.getArray( "imageAllowFiles" ) );
            conf.put( "fieldName", this.jsonConfig.getString( "imageFieldName" ) );
            savePath = this.jsonConfig.getString( "imagePathFormat" );
            break;
            
        case ActionMap.UPLOAD_VIDEO:
            conf.put( "maxSize", this.jsonConfig.getLong( "videoMaxSize" ) );
            conf.put( "allowFiles", this.getArray( "videoAllowFiles" ) );
            conf.put( "fieldName", this.jsonConfig.getString( "videoFieldName" ) );
            savePath = this.jsonConfig.getString( "videoPathFormat" );
            break;
            
        case ActionMap.UPLOAD_SCRAWL:
            conf.put( "filename", ConfigManager.SCRAWL_FILE_NAME );
            conf.put( "maxSize", this.jsonConfig.getLong( "scrawlMaxSize" ) );
            conf.put( "fieldName", this.jsonConfig.getString( "scrawlFieldName" ) );
            conf.put( "isBase64", "true" );
            savePath = this.jsonConfig.getString( "scrawlPathFormat" );
            break;
            
        case ActionMap.CATCH_IMAGE:
            conf.put( "filename", ConfigManager.REMOTE_FILE_NAME );
            conf.put( "filter", this.getArray( "catcherLocalDomain" ) );
            conf.put( "maxSize", this.jsonConfig.getLong( "catcherMaxSize" ) );
            conf.put( "allowFiles", this.getArray( "catcherAllowFiles" ) );
            conf.put( "fieldName", this.jsonConfig.getString( "catcherFieldName" ) + "[]" );
            savePath = this.jsonConfig.getString( "catcherPathFormat" );
            break;
            
        case ActionMap.LIST_IMAGE:
            conf.put( "allowFiles", this.getArray( "imageManagerAllowFiles" ) );
            conf.put( "dir", this.jsonConfig.getString( "imageManagerListPath" ) );
            conf.put( "count", this.jsonConfig.getInt( "imageManagerListSize" ) );
            break;
            
        case ActionMap.LIST_FILE:
            conf.put( "allowFiles", this.getArray( "fileManagerAllowFiles" ) );
            conf.put( "dir", this.jsonConfig.getString( "fileManagerListPath" ) );
            conf.put( "count", this.jsonConfig.getInt( "fileManagerListSize" ) );
            break;
            
    }
    
    conf.put( "savePath", savePath );
    conf.put( "rootPath", this.rootPath );
    
    return conf;
    
}


3. Uploader.java

    执行下载

4. State.java
    
    处理状态接口 ,前后台沟通的接口。
    
5. BaseState.java

    State 的其中一个实现类里面包含了一个 Map<String ,String > 实例，通过 Map 添加前台需要的参数。
    
    1. 前台请求规范
        ![](http://upload-images.jianshu.io/upload_images/4139030-0ccf38bfba31759b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
    
    2. 后台返回规范（以上传图片为例）
       ![](http://upload-images.jianshu.io/upload_images/4139030-666d2791beb13a2d.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

具体后台运行过程，自己用 debug 工具，多走几下就知道了（这里就不演示了）
运行项目
- 访问：
  http://localhost:8080/_ueditor/ueditor/index.html
- 上传图片功能也可正常使用

下一篇 : ueditor 实现自定义上传

3. 对 UEditor 文件上传的源码的理解

这里以上传图片为例

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