Add new feature of image cache.

rest/alien_controller.go

@@ -3,10 +3,11 @@ package rest
 import (
 	"fmt"
 	"net/http"
+	"os"
 	"regexp"
 	"strconv"
-	"time"
 	"strings"
+	"time"
 )
 
 type AlienController struct {
@@ -435,17 +436,48 @@ func (this *AlienController) Download(writer http.ResponseWriter, request *http.
 		}
 	}
 
-	//缓存
-	var uri string = request.RequestURI
-	//this.imageCacheDao.FindByUri(uri)
-	fmt.Printf(uri)
-
 	//对图片做缩放处理。
 	imageProcess := request.FormValue("imageProcess")
 	if imageProcess == "resize" {
-		this.matterService.ResizeImage(writer, request, matter)
+
+		//如果是图片，那么能用缓存就用缓存
+		uri := request.RequestURI
+		imageCache := this.imageCacheDao.FindByUri(uri)
+		if imageCache != nil {
+
+			//直接使用缓存中的信息
+			this.matterService.DownloadFile(writer, request, CONFIG.MatterPath+imageCache.Path, matter.Name)
+
+		} else {
+
+			//resize图片
+			dstImage := this.matterService.ResizeImage(request, CONFIG.MatterPath+matter.Path)
+
+			user := this.userDao.FindByUuid(matter.UserUuid)
+			//获取文件应该存放在的物理路径的绝对路径和相对路径。
+			absolutePath, relativePath := GetUserFilePath(user.Username, true)
+			absolutePath = absolutePath + "/" + filename
+			relativePath = relativePath + "/" + filename
+
+			fileWriter, err := os.Create(absolutePath)
+			this.PanicError(err)
+			defer fileWriter.Close()
+
+			//生成的图片输出到两个writer中去
+			this.matterService.DownloadImage(writer, fileWriter, dstImage, matter.Name)
+
+			//相关信息写到缓存中去
+			imageCache = &ImageCache{
+				UserUuid:   matter.UserUuid,
+				MatterUuid: matter.Uuid,
+				Uri:        uri,
+				Path:       relativePath,
+			}
+			this.imageCacheDao.Create(imageCache)
+		}
+
 	} else {
-		this.matterService.DownloadFile(writer, request, matter)
+		this.matterService.DownloadFile(writer, request, CONFIG.MatterPath+matter.Path, matter.Name)
 	}
 
 }