thinkphp（php）+Ajax上傳圖片

<code><form tag=<span>"img_file_upload"</span> id=<span>"file_upload"</span> name=<span>"file_upload"</span><span>method</span>=<span>"post"</span> action=<span>"<{:U('File/fileUpload')}>" enctype=<span>"multipart/form-data"</span>>
    <input <span><span>type</span>=</span><span>"file"</span> id=<span>"img"</span> name=<span>"file"</span>>
    <input <span><span>type</span>=</span><span>"hidden"</span> name=<span>"member_id"</span><span>value</span>=<span>"<{:$_SESSION[C('USER_AUTH_KEY')]}>"/>
    <input <span><span>type</span>=</span><span>"button"</span><span>value</span>=<span>"上传"</span> >"submitImgForm()"</span>/>
</form>

<img tag=<span>"show_photo_upload_img"</span> src=<span>""</span> alt=<span>""</span>/></code>

<code><span><<span>script</span>></span><span><span><span>function</span><span>submitImgForm</span><span>()</span>{</span><span>if</span> ($(<span>"#img"</span>).val() == <span>""</span>) {
            alert(<span>"请选择一个图片文件，再点击上传。"</span>);
            <span>return</span>;
        }
        <span>var</span> file_form = $(<span>"[tag='img_file_upload']"</span>);
        <span>var</span> show_img = $(<span>"[tag='show_photo_upload_img']"</span>);
        <span>var</span> options = {
            type : <span>'post'</span>,
            url : <span>"<{:U('File/fileUpload')}>"</span>,
            dataType: <span>'text'</span>,
            contentType: <span>"application/json; charset=utf-8"</span>,
            beforeSubmit:<span><span>function</span><span>()</span>{</span>
              alert(<span>'正在上传'</span>);
            },
            success:<span><span>function</span><span>(data)</span> {</span><span>var</span> json_obj = <span>JSON</span>.parse(data);

                show_img.attr(<span>'src'</span>,json_obj.img_path);
                alert(json_obj.error);
            },
            error:<span><span>function</span><span>(XmlHttpRequest, textStatus, errorThrown)</span>{</span>
                alert(textStatus);
                alert(errorThrown);
            }
        };

        file_form.ajaxSubmit(options);
    }
</span><span></<span>script</span>></span></code>

<code><span><span>function</span><span>fileUpload</span><span>()</span>{</span><span>$config</span> = C(<span>'FILE_UPLOAD_CONFIG'</span>);
        <span>//附带的信息</span><span>$request_data</span> = I(<span>'post.'</span>);
<span>//        show_bug($request_data);</span><span>$member_id</span> = <span>$request_data</span>[<span>'member_id'</span>];
        <span>if</span>(<span>empty</span>(<span>$the_file_usage</span>)){
            <span>$the_file_usage</span> = <span>$file_usage</span>[<span>'DOWNLOAD'</span>];
        }

<span>//        show_bug_with_exit($file_name);</span><span>$file_info</span>[<span>'member_id'</span>] = <span>$member_id</span>;
        <span>$file_info</span>[<span>'created_time'</span>] = time();

            <span>// 上传文件</span><span>//实例化上传类，传入上面的配置数组</span><span>$uploader</span> = <span>new</span> Upload(<span>$config</span>, <span>'Local'</span>);
<span>//            $uploader->saveName = $file_uuid;</span><span>$info</span> = <span>$uploader</span>->upload(<span>$_FILES</span>);
<span>//        show_bug_with_exit($info);</span><span>//这里判断是否上传成功</span><span>if</span> (<span>$info</span>) {
                <span>//// 上传成功 获取上传文件信息</span><span>foreach</span> (<span>$info</span><span>as</span> &<span>$file</span>) {
                    <span>//拼接出上传目录</span><span>$file</span>[<span>'rootpath'</span>] = __ROOT__ . ltrim(<span>$config</span>[<span>'rootPath'</span>], <span>"."</span>);
                    <span>//拼接出文件相对路径</span><span>$file</span>[<span>'filepath'</span>] = <span>$file</span>[<span>'rootpath'</span>] . <span>$file</span>[<span>'savepath'</span>] . <span>$file</span>[<span>'savename'</span>];
                }
                <span>//这里可以输出一下结果,相对路径的键名是$info['upload']['filepath']</span><span>$filepath</span> = <span>$file</span>[<span>'filepath'</span>];
<span>//                show_bug_with_exit($filepath);</span><span>$file_info</span>[<span>'file_path'</span>] = <span>$filepath</span>;


                <span>$save_file_in_DB</span> = <span>$this</span>->saveFileInfoIntoDB(<span>$file_info</span>);
                <span>//如果文件数据往数据库中存储失败，则删除文件</span><span>if</span>(!<span>$save_file_in_DB</span>){
                    unlink(<span>$filepath</span>);
                    <span>$return_data</span>[<span>'error'</span>] = <span>'文件上传失败，请重试'</span>;
                    <span>echo</span> json_encode(<span>$return_data</span>);
                }

                <span>$return_data</span>[<span>'error'</span>] = <span>'文件上传成功'</span>;
                <span>$return_data</span>[<span>'img_path'</span>] = <span>$filepath</span>;
                <span>$return_data</span>[<span>'img_id'</span>] = <span>$save_file_in_DB</span>;
                jsonReturn(<span>$return_data</span>);
            } <span>else</span> {
                <span>//输出错误信息</span><span>$error_msg</span> = <span>$uploader</span>->getError();
                <span>$return_data</span>[<span>'error'</span>] = <span>$error_msg</span>;
                jsonReturn(<span>$return_data</span>);
            }
    }


    <span><span>function</span><span>saveFileInfoIntoDB</span><span>(<span>$file_info</span>)</span>{</span><span>$file</span> = M(<span>'File'</span>);
        <span>$rs_u_file</span> = <span>$file</span>->add(<span>$file_info</span>);
        <span>$file_id</span> = <span>$file</span>->getLastInsID();
        <span>if</span>(!<span>$rs_u_file</span>){
            <span>return</span><span>false</span>;
        }
        <span>return</span><span>$file_id</span>;
    }</code>