java代码在阿里云函数计算中的应用
分享一个阿里云函数计算的java应用。
服务的功能是获取OSS中PPT模板，加载OSS中图片文件，合成PPT导出文件后，把文件回传到OSS方便下载的应用。
移植到函数计算的目的是OSS文件都在阿里云中，服务器迁移到了腾讯云，让代码更靠近数据，方便计算。
MAVEN配置里的build这块比较重要，把关联jar都会打包到一个jar中，这样才能上传到函数计算服务中。
1 <build>2 <plugins>
3 <plugin>
4 <artifactId>maven-assembly-plugin</artifactId>
5 <version>3.1.0</version>
6 <configuration>
7 <descriptorRefs>
8 <descriptorRef>jar-with-dependencies</descriptorRef>
9 </descriptorRefs>
10 <appendAssemblyId>false</appendAssemblyId> <!-- this is used for not append id to the jar name -->
11 </configuration>
12 <executions>
13 <execution>
14 <id>make-assembly</id> <!-- this is used for inheritance merges -->
15 <phase>package</phase> <!-- bind to the packaging phase -->
16 <goals>
17 <goal>single</goal>
18 </goals>
19 </execution>
20 </executions>
21 </plugin>
22 <plugin>
23 <groupId>org.apache.maven.plugins</groupId>
24 <artifactId>maven-compiler-plugin</artifactId>
25 <configuration>
26 <source>1.8</source>
27 <target>1.8</target>
28 </configuration>
29 </plugin>
30 </plugins>
31 </build>
1 package example;2
3 import java.io.BufferedReader;
4 import java.io.File;
5 import java.io.FileInputStream;
6 import java.io.IOException;
7 import java.io.InputStream;
8 import java.io.OutputStream;
9 import java.net.URLDecoder;
10 import java.util.List;
11 import java.util.Map;
12
13 import javax.servlet.ServletException;
14 import javax.servlet.http.HttpServletRequest;
15 import javax.servlet.http.HttpServletResponse;
16
17 import org.apache.commons.io.FileUtils;
18 import org.apache.commons.lang3.StringUtils;
19 import org.apache.poi.xslf.usermodel.XMLSlideShow;
20
21 import com.alibaba.fastjson.JSON;
22 import com.alibaba.fastjson.JSONObject;
23 import com.aliyun.fc.runtime.Context;
24 import com.aliyun.fc.runtime.FunctionComputeLogger;
25 import com.aliyun.fc.runtime.HttpRequestHandler;
26
27 public class App2 implements HttpRequestHandler {
28
29 /**
30 * 模板默认的可变化的起始页，从这页开始插入生成的PPT
31 */
32 public static final String FIELD_FLAG = "#";
33
34 private static final Map<String, String> POINT_MAP = BizConstants.getInnerAttributeMap();
35
36 private FunctionComputeLogger logger;
37
38 private String getV(HttpServletRequest request, String key) {
39 return (String)request.getAttribute(key);
40 }
41
42 /**
43 * 获取body中的内容
44 *
45 * @param request
46 * @return
47 */
48 private String getBody(HttpServletRequest request) {
49 BufferedReader br;
50 try {
51 br = request.getReader();
52 String str, wholeStr = "";
53 while ((str = br.readLine()) != null) {
54 wholeStr += str;
55 }
56 wholeStr = URLDecoder.decode(wholeStr, "utf-8");
57 return wholeStr;
58 } catch (IOException e) {
59 e.printStackTrace();
60 }
61 return null;
62 }
63
64 public void handleRequest(HttpServletRequest request, HttpServletResponse response, Context context)
65 throws IOException, ServletException {
66
67 logger = context.getLogger();
68
69
70 /**
71 * 获取客户端提交的BODY部分数据
72 */
73 String body = getBody(request);
74
75 logger.info("body=====>" + body);
76
77 /**
78 * 解析JSON对象
79 */
80 JSONObject obj = JSON.parseObject(body);
81
82 Integer pageSize = obj.getInteger("pageSize");
83 String pptUrl = obj.getString("pptUrl");
84 String pointsJson = obj.getString("points");
85 String downloadName = obj.getString("downloadName");
86 logger.info("pageSize=====>" + pageSize);
87 logger.info("pptUrl=====>" + pptUrl);
88 logger.info("downloadName=====>" + downloadName);
89 List<Point> points = JSON.parseArray(pointsJson, Point.class);
90 logger.info("points==size===>" + points.size());
91
92 String filePath = saveExportPpt(points, pageSize, pptUrl);
93
94 logger.info("filePath==========>{}" + filePath);
95
96 String url = "";
97 /**
98 * 上传生成好的PPT文件到OSS中
99 * 方便用户下载
100 */
101 if (StringUtils.isNotBlank(filePath)) {
102 url = OssUtils.saveTempFile(filePath, downloadName);
103 }
104 logger.info("saveTempFile===url==>" + url);
105
106 response.setStatus(200);
107 OutputStream out = response.getOutputStream();
108 out.write(url.getBytes());
109 out.flush();
110 out.close();
111 }
112
113
114
115 /**
116 业务代码，生成PPT文件
117 */
118 public String saveExportPpt(List<Point> points, Integer pageSize, String pptUrl) {
119 try {
120 File file = File.createTempFile(System.nanoTime() + "", ".pptx");
121 String absolutePath = file.getAbsolutePath();
122 logger.info("file=====length===>" + file.length());
123 return absolutePath;
124 } catch (Exception e) {
125 logger.info("Exception" + e.toString());
126 }
127 return null;
128 }
129
130 /**
131 * 从OSS获取PPT模板，生成PPT模板类
132 * @param pptUrl
133 * @return
134 */
135 private XMLSlideShow getSlideShow(String pptUrl) {
136 File pptFile = null;
137 try {
138 pptFile = File.createTempFile(System.nanoTime() + ".", StringUtils.substringAfterLast(pptUrl, "."));
139
140 /**
141 * 通过OSS SDK获取模板文件到函数计算服务器
142 */
143 OssUtils.getImage(pptUrl, pptFile);
144
145 logger.info("pptFile==getAbsolutePath===>" + pptFile.getAbsolutePath());
146 logger.info("pptFile==exists===>" + pptFile.exists());
147 logger.info("pptFile==length===>" + pptFile.length());
148
149 } catch (Exception e) {
150 e.printStackTrace();
151 }
152 if (pptFile == null || !pptFile.exists()) {
153 return null;
154 }
155 try {
156 InputStream is = new FileInputStream(pptFile);
157 XMLSlideShow slideShow = new XMLSlideShow(is);
158 is.close();
159 return slideShow;
160 } catch (Exception e1) {
161
162 }
163 return null;
164 }
165
166 /**
167 * 通过OSS SDK获取PPT中需要添加的图片到函数计算服务器本地
168 */
169 private byte[] getImage(String imageUrl) {
170 try {
171 File destFile = File.createTempFile("temp", "." + StringUtils.substringAfterLast(imageUrl, "."));
172 OssUtils.getImage(imageUrl, destFile);
173 byte[] pictureData = FileUtils.readFileToByteArray(destFile);
174 destFile.deleteOnExit();
175 return pictureData;
176 } catch (Exception e) {
177 return null;
178 }
179 }
180
181 }
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