常见问题汇总(七)——关于Spring

桃扇骨 2022-05-23 12:57 227阅读 0赞

### 1、 applicationContext.xml路径问题 ###

默认在web-inf下，开发中配置在src下，需要在web.xml中配置路径

注意，是classpath而不是classPath

### 2、 Failed to read candidate component class:  ###

Spring 版本过低，不支持当前JDK版本

### 3、jar部署方式中文件读写 ###

可以采用相对路径的方式实现文件存储：

public static String getExportFileName(String prefixFileName, FileType fileType) {
            String fileName = prefixFileName + "-" + new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
            return "./test" + "/" + fileName + "." + fileType.getExtension();
        }
    
        public static String saveImportFile(MultipartFile file, Long statementBatchId) {
            String saveFileName = getExportFileName("批次" + statementBatchId + "导入", FileType.XLS);
            File saveFile = new File(saveFileName);
            try {
                FileUtils.writeByteArrayToFile(saveFile, file.getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
    
            return saveFileName;
        }

### 4、多线程，或者事务过大，可以采用手动事务 ###

@Autowired
        private PlatformTransactionManager platformTransactionManager;
    
        @Autowired
        private TransactionDefinition transactionDefinition;
    
    
     TransactionStatus transactionStatus = platformTransactionManager.getTransaction(transactionDefinition);
            try {
    
                    save = packageStatementItemService.save(itemEntity);
                    StopWatch watch = new StopWatch();
                    watch.start();
                    statementCheckingService.checkingPackageAfterImport(itemEntity, userId, userName);
                    watch.stop();
                    platformTransactionManager.commit(transactionStatus);
                    log.info(LogTempalte.TIME_LOG_DEBUG,"包裹对账，单条重新匹配用时",watch.getTotalTimeSeconds());
            } catch (Exception e) {
                log.error(e.getMessage());
                error.add(String.format("系统异常【%s】", e.getMessage()));
                save = false;
                platformTransactionManager.rollback(transactionStatus);
            }

### 5、PKIX path building failed（SSL证书未被信任）  ###

解决方案：1、信任证书

keytool -importcert -alias "passport" -file /xx.crt  -keystore /srv/java/jdk1.8.0_171/jre/lib/security/cacerts -storepass changeit

2、忽略证书

public void afterPropertiesSet() throws Exception {
            requestFactory = new HttpComponentsClientHttpRequestFactory(){
                private HttpClientContext context;
                {
                    log.info("passport账号为：" + passportConfig.getApplicationAccessKey() + " 密码为：" + passportConfig.getApplicationAccessPassword());
                    context = HttpClientContext.create();
                    CredentialsProvider credsProvider = new BasicCredentialsProvider();
                    credsProvider.setCredentials(org.apache.http.auth.AuthScope.ANY,
                            new org.apache.http.auth.UsernamePasswordCredentials(passportConfig.getApplicationAccessKey(), passportConfig.getApplicationAccessPassword()));
                    context.setCredentialsProvider(credsProvider);
                }
    
                @Override
                protected HttpContext createHttpContext(HttpMethod httpMethod, URI uri) {
                    return context;
                }
            };
    
            requestFactory.setHttpClient(getHttpsClient());
            restTemplate = new RestTemplate(requestFactory);
        }
    
    
        public static CloseableHttpClient getHttpsClient() {
    
            CloseableHttpClient httpClient;
            SSLContext sslContext = null;
            try {
                sslContext = SSLContexts.custom().loadTrustMaterial(null, new TrustStrategy() {
                    @Override
                    public boolean isTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
                        return true;
                    }
                }).build();
            } catch (NoSuchAlgorithmException e) {
                e.getStackTrace();
            } catch (KeyManagementException e) {
                e.getStackTrace();
            } catch (KeyStoreException e) {
                e.getStackTrace();
            }
            httpClient = HttpClients.custom().setSSLContext(sslContext).
                    setSSLHostnameVerifier(new NoopHostnameVerifier()).build();
            return httpClient;
        }

### 6、com java.lang.NoSuchMethodError：XXX ###

通常是由于包冲突导致

解决方案有两个：a:去掉多余的版本  b:利用dependencyManager控制版本