预览文件流
previewFile() {
wx.request({
url: 'XXX/downContractFile',
method: "get",
responseType: "arraybuffer", //此处是请求文件流，必须带入的属性
header: {
"content-type": "application/json",
Authorization: "Bearer " + wx.getStorageSync("token"),
Cookie: "JSESSIONID=" + wx.getStorageSync("sessionID"),
},
success: rest => {
const fs = wx.getFileSystemManager(); //获取全局唯一的文件管理器
fs.writeFile({ // 写文件
filePath: wx.env.USER_DATA_PATH + "/电子发票在线预览.pdf", // wx.env.USER_DATA_PATH 指定临时文件存入的路
data: rest.data,
encoding: "binary", //二进制流文件必须是 binary
success(res) {
wx.openDocument({ // 新开页面打开文档
filePath: wx.env.USER_DATA_PATH + "/电子发票在线预览.pdf", //拿上面存入的文件路径
fileType: 'pdf',
showMenu: true,
success: function (res) {
setTimeout(() => {
wx.hideLoading()
}, 500)
}
})
}
})
}
})
}
下载文件流 1、获取文件流
downFile() {
let that = this;
wx.downloadFile({
url: `${common.config.downContractFile}`,
responseType: "arraybuffer", //此处是请求文件流，必须带入的属性
header: {
"content-type": "application/pdf",
Authorization: "Bearer " + wx.getStorageSync("token"),
Cookie: "JSESSIONID=" + wx.getStorageSync("sessionID"),
},
success: async function (res) {
if (res.statusCode === 200) {
//读取文件流
let readRes = await that.getReadRes(res)
//写入文件流
let writeRes = await that.writeFileRes(readRes)
}
},
fail: function (error) {
console.error('下载失败', error);
}
});
}
读取文件流 getReadRes(res) {
return new Promise((resolve, reject) => {
const fs = wx.getFileSystemManager();
fs.readFile({
filePath: res.tempFilePath,
encoding: 'binary', // 读取为二进制格式
success(readRes) {
resolve(readRes)
},
fail(err) {
reject('文件读取失败')
}
});
})
} 写入文件流
writeFileRes(readRes) {
return new Promise((resolve, reject) => {
const fs = wx.getFileSystemManager();
fs.writeFile({ //
filePath: wx.env.USER_DATA_PATH + "/电子发票在线预览.pdf", // wx.env.USER_DATA_PATH 指定临时文件存入的路
data: readRes.data,
encoding: "binary", //二进制流文件必须是 binary
success(res) {
resolve()
}
})
})
}
转发下载文档
shareFileMessage(){
wx.shareFileMessage({
filePath: wx.env.USER_DATA_PATH + "/电子发票在线预览.pdf",
fileName: '发票预览',
success() {},
fail: console.error,
})
}
