File:文件读取
安装:
cordova plugin add cordova-plugin-file --save
cordova plugin rm cordova-plugin-file --save
配置 cdvfile:
config.xml:
<access origin="cdvfile://*" />
index.html: Content-Security-Policy 增加 cdvfile:
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap:cdvfile:https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">
主要的几个对象:
FileSystem
Entry
DirectoryEntry
FileEntry
三种路径格式:
//第一种:file
alert("file:///x/y/z/");
//第二种:cdvdile
alert("cdvfile://localhost/persistent/x/y/z");
alert("cdvfile://localhost/temporary/x/y/z");
//第三种:
alert(cordova.file.applicationDirectory);
alert(cordova.file.applicationStorageDirectory);
alert(cordova.file.dataDirectory);
alert(cordova.file.cacheDirectory);
alert(cordova.file.externalApplicationStorageDirectory);
alert(cordova.file.externalDataDirectory);
alert(cordova.file.externalCacheDirectory);
alert(cordova.file.externalRootDirectory);
alert(cordova.file.tempDirectory);
alert(cordova.file.syncedDataDirectory);
alert(cordova.file.documentsDirectory);
alert(cordova.file.sharedDirectory);
路径操作:(获取Entry/转换路径)
1、requestFileSystem:仅两个目录 PERSISTENT / TEMPORARY
window.requestFileSystem(存储类型,期望存储空间大小(b字节),成功回调,失败回调)
存储类型:LocalFileSystem.PERSISTENT / LocalFileSystem.TEMPORARY
返回 FileSystem {name: string, root: DirectoryEntry}
window.requestFileSystem(
LocalFileSystem.PERSISTENT, //永久目录
//LocalFileSystem.TEMPORARY, //临时目录
0, //如果是需要创建 PERSISTENT 永久文件 需要为0
function (fs) { //fs FileSystem {name: string, root: DirectoryEntry}
alert("fs名字:" + fs.name); //persistent
alert("DirectoryEntry:"+fs.root); // DirectoryEntry 对象
alert("DirectoryEntry isFile:"+fs.root.isFile); //false
alert("DirectoryEntry isDirectory:"+fs.root.isDirectory); //true
alert("DirectoryEntry name:"+fs.root.name); //""
alert("DirectoryEntry fullPath:"+fs.root.fullPath); // /
alert("DirectoryEntry fileSystem:"+fs.root.fileSystem); // undefined
alert("DirectoryEntry nativeURL:"+fs.root.nativeURL); // file:///data/data/com.example.hello/files/files/
},
function (file_error) {
alert("错误:" + file_error);
}
);
2、window.resolveLocalFileSystemURL:可以转换路径(native file <-> cdvfile)
window.resolveLocalFileSystemURL("url", 成功回调, 错误回调);
var native_path = "file:///";
// var cdvfile_path = "cdvfile://localhost/persistent/";
window.resolveLocalFileSystemURL(
native_path,
//cdvfile_path,
function (entry) {
alert("entry isFile:"+entry.isFile); //false
alert("entry isDirectory:"+entry.isDirectory); //true
alert("entry name:"+entry.name); //""
alert("entry fullPath:"+entry.fullPath); // /
alert("entry fileSystem:"+entry.fileSystem); // undefined
alert("entry nativeURL:"+entry.nativeURL); // file:///data/data/com.example.hello/files/files/
alert('entry toURL: ' + entry.toURL()); // file:///data/data/com.example.hello/files/files/
alert('entry toInternalURL: ' + entry.toInternalURL()); // cdvfile://localhost/persistent/
},
function(file_error){
alert("错误:" + file_error);
}
);
目录操作:(创建/遍历/删除)
var entry = xxx; //通过 requestFileSystem / resolveLocalFileSystemURL 获得
entry.getDirectory(
"new_path",
{create: true},
function (directory_entry) {
alert("创建目录成功");
},
function (file_error) {
alert("错误:" + file_error);
}
);
entry.getDirectory(
"",
{create: false},
function (directory_entry) {
directory_entry.createReader().readEntries( //如果 entry 已经是 DirectoryEntry 可以直接从这步开始
function(entry_array){
alert("遍历目录:");
for(var index in entry_array){
alert(entry_array[index].toURL()); //native file
alert(entry_array[index].toInternalURL()); //cdvfile
}
},
function (file_error) {
alert("遍历错误:" + file_error);
}
);
},
function (file_error) {
alert("错误:" + file_error);
}
);
entry.getDirectory(
"new_path", //注意:根目录""不能够删除
{create: false},
function (directory_entry) {
directory_entry.removeRecursively( //如果 entry 已经是 DirectoryEntry 可以直接从这步开始
function(){
alert("删除目录成功");
},
function (file_error) {
alert("删除目录错误:" + file_error);
}
);
},
function (file_error) {
alert("错误:" + file_error);
}
);
文件操作:(创建/写/追加/读/删除)
var entry = xxx; //通过 requestFileSystem / resolveLocalFileSystemURL 获得
//创建
entry.getFile(
"file_name.txt",
{ create: true, exclusive: false },
function (file_entry) {
//写入
var blob = new Blob(
['测试测试测试测试测试'],
{type: 'text/plain'}
);
file_entry.createWriter(
function (file_writer) {
file_writer.onwriteend = function () {
alert("写入完成");
};
file_writer.onerror = function (e) {
alert("写入失败");
};
// 移动指针 === 追加写入
/*
try {
fileWriter.seek(fileWriter.length);
} catch (e) {
alert("移动指针错误:" + e);
}
*/
file_writer.write(blob); //写入内容
},
function (file_error) {
alert("写入错误:" + file_error);
}
);
},
function(file_error){
alert("错误:" + file_error);
}
);
//读取
entry.getFile(
"file_name.txt",
{ create: false, exclusive: false },
function (file_entry) {
file_entry.file( //如果 entry 已经是 FileEntry 可以直接从这步开始
function (file) {
var reader = new FileReader();
reader.onloadend = function () {
alert("读取成功");
alert("读取内容:" + this.result);
};
reader.onerror = function(){
alert("读取失败");
};
reader.readAsText(file);
},
function (file_error) {
alert("错误:" + file_error);
}
);
},
function(file_error){
alert("错误:" + file_error);
}
);
//删除:
entry.getFile(
"file_name.txt",
{ create: false, exclusive: false },
function (file_entry) {
file_entry.remove( //如果 entry 已经是 FileEntry 可以直接从这步开始
function () {
alert("删除失败");
},
function (file_error) {
alert("删除错误:" + file_error);
}
);
},
function(file_error){
alert("错误:" + file_error);
}
);
file transfer 文件上传下载:
安装:
cordova plugin add cordova-plugin-file-transfer --save
cordova plugin rm cordova-plugin-file-transfer --save
上传:
//参数:
var options = new FileUploadOptions();
options.fileKey = "file"; //类型,默认文件
options.fileName = fileURL.substr(fileURL.lastIndexOf('/') + 1); //文件名
options.httpMethod = "POST"; //默认POST
options.mimeType = "text/plain";
options.trustAllHosts = true; //是否接受所有证书 默认false
options.params = { //请求参数 键值对
value1:"test",
value2:"param"
};
var ft = new FileTransfer();
//upload(文件路径,上传路径(encodeURI编码),成功回调,失败回调,参数);
ft.upload("",
encodeURI("http://some.server.com/upload.php"),
function(file_upload_result){
alert("响应码:" + file_upload_result.responseCode);
alert("响应:" + file_upload_result.response);
alert("发送字节数:" + file_upload_result.bytesSent);
},
function(error){
alert("错误码:" + error.code);
alert("错误资源:" + error.source);
alert("错误目标:" + error.target);
},
options
);
下载:
var fileTransfer = new FileTransfer();
//download(下载路径(encodeURI), 存储位置,成功回调,错误回调,是否信任所有证书,参数)
fileTransfer.download(
encodeURI("http://some.server.com/download.php"),
"filepath",
function(entry) {
console.log("download complete: " + entry.toURL());
},
function(error) {
console.log("download error source " + error.source);
console.log("download error target " + error.target);
console.log("download error code" + error.code);
},
true,
{
headers: {
// "Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="
}
}
);
中止:
ft.abort(); //会给回调函数返回错误:FileTransferError.ABORT_ERR
file opener2 本地默认软件打开文件:
安装:
cordova plugin add cordova-plugin-file-opener2 --save
cordova plugin rm cordova-plugin-file-opener2 --save
使用:
cordova.plugins.fileOpener2.open(
//文件路径:格式:"/sdcard/Download/starwars.pdf"
//也可以是 cdvfile 格式 "cdvfile://localhost/persistent/Download/starwars.pdf"
"filePath",
"fileMIMEType", //文件类型'application/pdf',
{
error : function(e){alert("失败"+e)},
success : function(){alert("成功")}
}
);