上传图片功能代码说明

说明：样式不一定美观，主要说明上传逻辑和代码细节说明

改进后：

【页面效果】

【jsp页面】

说明：

1：上传核心的两个input 一个name=photourl 一个name=projectUpload； <img>用于回显图片

2：name=photourl的input样式说明： “hidden="hidden" type="hidden" 如果不添加的话会出现如下效果：影响美观

name=projectUpload样式说明：事件必须是onchange（）事件不要用处onclick事件，

style=" width:73px; overflow: hidden;padding-left: 20px;"中width的定义目的为了隐藏”未选择任何文件“如图

overflow没有调试出用处先保留 padding-left用于美观调间距

 1                             <tr>
 2                                 <td class="in-lab" width="15%">成果主图:</td>
 3                                 <td class="in-ctt" colspan="3">
 4                                 <input name="photourl" id="photourl" value="${bean.photourl}" hidden="hidden" type="hidden"/>
 5                                 <div class="uploadBox">
 6                                     <input type="file" id="projectUpload" name="projectUpload" onchange="upload();" 
 7                                             style=" width:73px; overflow: hidden;padding-left: 20px;"/>
 8                                     (请上传规格为260*188像素大小的图片)
 9                                 </div>
10                                 <div class="imageTips">
11                                     <img style="width: 120px; height: 120px" src="${bean.photourl}" />
12                                 </div>
13                                 </td>
14                         </tr>

js代码说明：

1：upload()方法调用uploadImg()方法

2：projectUpload参数是往后台传递的参数需要与input中的name=projectUpload的值一致

3：id为photourl的input用于接受ajax返回的图片上传路径；

4：class为imageTips的div用于显示上传的图片，因为此处只上传一个图片所以只显示一个图片需要清空之前的url 否则会出现显示多个图片的情形

 1 //成果主图
 2       function upload(){
 3          uploadImg();
 4      }
 5     function uploadImg(){
 6     //loading
 7     $("#loading").ajaxStart(function() {
 8         $(this).show();
 9     }).ajaxComplete(function() {
10         $(this).hide();
11     });
12     var elementIds=["flag"]; //flag为id、name属性名
13     $.ajaxFileUpload({
14         url: '/file/upload.jspx',//接口url
15         type: 'post',
16         secureuri: false, //一般设置为false
17         fileElementId: 'projectUpload', // 上传文件的id、name属性名
18         dataType: 'text', //返回值类型，一般设置为json、application/json
19         elementIds: elementIds, //传递参数到服务器
20         success: function(data, status){
21             
22             var temp =  $.parseJSON(data);
23             var fileUrl = temp.fileUrl;
24             $("#photourl").val(fileUrl);
25             $(".imageTips").empty();             
26             $(".imageTips").append("<img height=\"100\" width=\"100\" src=\""+fileUrl+"\"></img> ");
27             alert("上传成功！");
28         },
29         error: function(data, status, e){ 
30             alert(e);
31         }
32     });
33 }

后台函数：

1：该后台函数已经封装了很多函数，所以只是看下逻辑

2：参数名为projectUpload

 1     @RequestMapping( value = "/file/upload.jspx", method = RequestMethod.POST )
 2     public void avatarUpload( @RequestParam( value = "projectUpload", required = false ) MultipartFile file,
 3             HttpServletRequest request, HttpServletResponse response, org.springframework.ui.Model modelMap ) {
 4         JsonMapper mapper = new JsonMapper();
 5         UploadResult result = new UploadResult();
 6         try {
 7             doAvatarUpload( file, result, request, response );
 8         }
 9         catch( Exception e ) {
10             logger.error( "upload avatar image error.", e );
11             result.setError( e.getMessage() );
12         }
13         String json = mapper.toJson( result );
14         logger.debug( json );
15         Servlets.writeHtml( response, json );
16         return;
17     }

【真正上传图片函数】

 1     private void doAvatarUpload( MultipartFile file, UploadResult result, HttpServletRequest request, HttpServletResponse response )
 2             throws Exception {
 3         // 文件是否存在
 4         if( !validateFile( file, result ) ) {
 5             return;
 6         }
 7         Site site = Context.getCurrentSite( request );
 8         User user = Context.getCurrentUser( request );
 9 
10         String origFilename = file.getOriginalFilename();
11         String ext = FilenameUtils.getExtension( origFilename ).toLowerCase();
12         GlobalUpload gu = site.getGlobal().getUpload();
13         // 后缀名是否合法
14         if( !validateExt( ext, Uploader.IMAGE, gu, result ) ) {
15             return;
16         }
17         BufferedImage buffImg = ImageIO.read( file.getInputStream() );
18 
19         PublishPoint point = user.getGlobal().getUploadsPublishPoint();
20         FileHandler fileHandler = point.getFileHandler( pathResolver );
21         String fileName = "project_" + System.currentTimeMillis() + "." + ext;
22         String pathname = "/project/" + user.getProjectId() + "/" + fileName;
23         String urlPrefix = point.getUrlPrefix();
24         String fileUrl = urlPrefix + pathname;
25         // 一律存储为jpg
26         fileHandler.storeImage( buffImg, ext, pathname );
27         result.setFileUrl( fileUrl );
28         result.setFileName( fileName );
29     }

【json转换类还没时间研究】

  1 package com.jspxcms.common.util;
  2 
  3 import java.io.IOException;
  4 import java.text.SimpleDateFormat;
  5 import java.util.SimpleTimeZone;
  6 
  7 import org.apache.commons.lang3.StringUtils;
  8 import org.slf4j.Logger;
  9 import org.slf4j.LoggerFactory;
 10 
 11 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 12 import com.fasterxml.jackson.core.JsonProcessingException;
 13 import com.fasterxml.jackson.databind.DeserializationFeature;
 14 import com.fasterxml.jackson.databind.JavaType;
 15 import com.fasterxml.jackson.databind.ObjectMapper;
 16 import com.fasterxml.jackson.databind.SerializationFeature;
 17 import com.fasterxml.jackson.databind.util.JSONPObject;
 18 
 19 /**
 20  * Json转换类
 21  * 
 22  * @author liufang
 23  * 
 24  */
 25 public class JsonMapper {
 26 
 27     private static Logger logger = LoggerFactory.getLogger(JsonMapper.class);
 28 
 29     private ObjectMapper mapper;
 30 
 31     public JsonMapper() {
 32         this(null);
 33     }
 34 
 35     public JsonMapper(Include include) {
 36         mapper = new ObjectMapper();
 37         // 设置输出时包含属性的风格
 38         if (include != null) {
 39             mapper.setSerializationInclusion(include);
 40         }
 41         mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
 42         // 设置输入时忽略在JSON字符串中存在但Java对象实际没有的属性
 43         mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
 44     }
 45 
 46     /**
 47      * 创建只输出非Null且非Empty(如List.isEmpty)的属性到Json字符串的Mapper,建议在外部接口中使用.
 48      */
 49     public static JsonMapper nonEmptyMapper() {
 50         return new JsonMapper(Include.NON_EMPTY);
 51     }
 52 
 53     /**
 54      * 创建只输出初始值被改变的属性到Json字符串的Mapper, 最节约的存储方式，建议在内部接口中使用。
 55      */
 56     public static JsonMapper nonDefaultMapper() {
 57         return new JsonMapper(Include.NON_DEFAULT);
 58     }
 59 
 60     /**
 61      * Object可以是POJO，也可以是Collection或数组。 如果对象为Null, 返回"null". 如果集合为空集合, 返回"[]".
 62      */
 63     public String toJson(Object object) {
 64 
 65         try {
 66             return mapper.writeValueAsString(object);
 67         } catch (IOException e) {
 68             logger.warn("write to json string error:" + object, e);
 69             return null;
 70         }
 71     }
 72 
 73     /**
 74      * 反序列化POJO或简单Collection如List<String>.
 75      * 
 76      * 如果JSON字符串为Null或"null"字符串, 返回Null. 如果JSON字符串为"[]", 返回空集合.
 77      * 
 78      * 如需反序列化复杂Collection如List<MyBean>, 请使用fromJson(String,JavaType)
 79      * 
 80      * @see #fromJson(String, JavaType)
 81      */
 82     public <T> T fromJson(String jsonString, Class<T> clazz) {
 83         if (StringUtils.isEmpty(jsonString)) {
 84             return null;
 85         }
 86 
 87         try {
 88             return mapper.readValue(jsonString, clazz);
 89         } catch (IOException e) {
 90             logger.warn("parse json string error:" + jsonString, e);
 91             return null;
 92         }
 93     }
 94 
 95     /**
 96      * 反序列化复杂Collection如List<Bean>, 先使用函數createCollectionType构造类型,然后调用本函数.
 97      * 
 98      * @see #createCollectionType(Class, Class...)
 99      */
100     @SuppressWarnings("unchecked")
101     public <T> T fromJson(String jsonString, JavaType javaType) {
102         if (StringUtils.isEmpty(jsonString)) {
103             return null;
104         }
105 
106         try {
107             return (T) mapper.readValue(jsonString, javaType);
108         } catch (IOException e) {
109             logger.warn("parse json string error:" + jsonString, e);
110             return null;
111         }
112     }
113 
114     /**
115      * 構造泛型的Collection Type如: ArrayList<MyBean>,
116      * 则调用constructCollectionType(ArrayList.class,MyBean.class)
117      * HashMap<String,MyBean>, 则调用(HashMap.class,String.class, MyBean.class)
118      */
119     public JavaType createCollectionType(Class<?> collectionClass,
120             Class<?>... elementClasses) {
121         return mapper.getTypeFactory().constructParametricType(collectionClass,
122                 elementClasses);
123     }
124 
125     /**
126      * 當JSON裡只含有Bean的部分屬性時，更新一個已存在Bean，只覆蓋該部分的屬性.
127      */
128     @SuppressWarnings("unchecked")
129     public <T> T update(String jsonString, T object) {
130         try {
131             return (T) mapper.readerForUpdating(object).readValue(jsonString);
132         } catch (JsonProcessingException e) {
133             logger.warn("update json string:" + jsonString + " to object:"
134                     + object + " error.", e);
135         } catch (IOException e) {
136             logger.warn("update json string:" + jsonString + " to object:"
137                     + object + " error.", e);
138         }
139         return null;
140     }
141 
142     /**
143      * 輸出JSONP格式數據.
144      */
145     public String toJsonP(String functionName, Object object) {
146         return toJson(new JSONPObject(functionName, object));
147     }
148 
149     /**
150      * 設定是否使用Enum的toString函數來讀寫Enum, 為False時時使用Enum的name()函數來讀寫Enum, 默認為False.
151      * 注意本函數一定要在Mapper創建後, 所有的讀寫動作之前調用.
152      */
153     public void enableEnumUseToString() {
154         mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
155         mapper.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
156     }
157 
158     /**
159      * 支持使用Jaxb的Annotation，使得POJO上的annotation不用与Jackson耦合。
160      * 默认会先查找jaxb的annotation，如果找不到再找jackson的。
161      */
162     // public void enableJaxbAnnotation() {
163     // JaxbAnnotationModule module = new JaxbAnnotationModule();
164     // mapper.registerModule(module);
165     // }
166 
167     /**
168      * 取出Mapper做进一步的设置或使用其他序列化API.
169      */
170     public ObjectMapper getMapper() {
171         return mapper;
172     }
173 }

【结果类有时间研究】

  1 package com.jspxcms.common.upload;
  2 
  3 import java.util.Date;
  4 import java.util.Locale;
  5 
  6 import org.springframework.context.MessageSource;
  7 
  8 public class UploadResult {
  9     /**
 10      * 错误状态码
 11      */
 12     public static final int ERROR_STATUS = 500;
 13 
 14     private int status = 0;
 15     private String message;
 16     private String fileUrl;
 17     private String fileName;
 18     private long fileLength;
 19     private String fileExtension;
 20     private String pdfUrl;
 21     private String swfUrl;
 22     private int fileId;
 23 
 24     private Date   time;
 25     private MessageSource messageSource;
 26     private Locale locale;
 27 
 28     public UploadResult() {
 29     }
 30 
 31     public UploadResult(String fileUrl, String fileName, String fileExtension,
 32             long fileLength) {
 33         set(fileUrl, fileName, fileExtension, fileLength);
 34     }
 35 
 36     public void setMessageSource(MessageSource messageSource, Locale locale) {
 37         this.messageSource = messageSource;
 38         this.locale = locale;
 39     }
 40 
 41     public void set(String fileUrl, String fileName, String fileExtension,
 42             long fileLength) {
 43         this.fileUrl = fileUrl;
 44         this.fileName = fileName;
 45         this.fileExtension = fileExtension;
 46         this.fileLength = fileLength;
 47     }
 48 
 49     public void set(Integer fileId, String fileUrl, String fileName, String fileExtension,
 50             long fileLength, String pdfUrl, String swfUrl) {
 51         this.fileId = fileId;
 52         this.fileUrl = fileUrl;
 53         this.fileName = fileName;
 54         this.fileExtension = fileExtension;
 55         this.fileLength = fileLength;
 56         this.pdfUrl = pdfUrl;
 57         this.swfUrl = swfUrl;
 58     }
 59 
 60     public void setError(String message) {
 61         this.status = ERROR_STATUS;
 62         this.message = message;
 63     }
 64 
 65     public void setErrorCode(String code) {
 66         setErrorCode(code, null);
 67     }
 68 
 69     public void setErrorCode(String code, String[] args) {
 70         this.status = ERROR_STATUS;
 71         setCode(code, args);
 72     }
 73 
 74     public void setCode(String code) {
 75         setCode(code, null);
 76     }
 77 
 78     public void setCode(String code, String[] args) {
 79         if (messageSource != null && locale != null) {
 80             setMessage(messageSource.getMessage(code, args, code, locale));
 81         } else {
 82             this.message = code;
 83         }
 84     }
 85 
 86     public boolean isError() {
 87         return status >= ERROR_STATUS;
 88     }
 89 
 90     public boolean isSuccess() {
 91         return !isError();
 92     }
 93 
 94     public int getStatus() {
 95         return status;
 96     }
 97 
 98     public void setStatus(int status) {
 99         this.status = status;
100     }
101 
102     public String getMessage() {
103         return message;
104     }
105 
106     public void setMessage(String message) {
107         this.message = message;
108     }
109 
110     public String getFileUrl() {
111         return fileUrl;
112     }
113 
114     public void setFileUrl(String fileUrl) {
115         this.fileUrl = fileUrl;
116     }
117 
118     public String getFileName() {
119         return fileName;
120     }
121 
122     public void setFileName(String fileName) {
123         this.fileName = fileName;
124     }
125 
126     public long getFileLength() {
127         return fileLength;
128     }
129 
130     public void setFileLength(long fileLength) {
131         this.fileLength = fileLength;
132     }
133 
134     public String getFileExtension() {
135         return fileExtension;
136     }
137 
138     public void setFileExtension(String fileExtension) {
139         this.fileExtension = fileExtension;
140     }
141 
142     public String getPdfUrl() {
143         return pdfUrl;
144     }
145 
146     public void setPdfUrl(String pdfUrl) {
147         this.pdfUrl = pdfUrl;
148     }
149 
150     public String getSwfUrl() {
151         return swfUrl;
152     }
153 
154     public void setSwfUrl(String swfUrl) {
155         this.swfUrl = swfUrl;
156     }
157 
158     public Date getTime() {
159         return time;
160     }
161 
162     public void setTime(Date time) {
163         this.time = time;
164     }
165 
166     public int getFileId() {
167         return fileId;
168     }
169 
170     public void setFileId(int fileId) {
171         this.fileId = fileId;
172     }
173 
174     
175 }

posted @ 2016-10-21 16:17 涤新云阅读(9553) 评论(0) 编辑收藏举报

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