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如圖，Java用poi操作excel，當(dāng)cell是null的時(shí)候，如何讓他變成空字符串呢？

直接賦值不行呀

From [Javadiscussion group] 2017-04-18 09:42:09 0  3  988

java - 面試題：談?wù)剺I(yè)務(wù)中使用分布式的場(chǎng)景

面試的時(shí)候，面試官直接問(wèn)，說(shuō)說(shuō)項(xiàng)目中使用分布式的場(chǎng)景？感覺(jué)現(xiàn)在的面試，高并發(fā)和分布式是面試的標(biāo)配啊，說(shuō)實(shí)話，雖然項(xiàng)目的底層用了8臺(tái)機(jī)器做集群，但是使用分布式場(chǎng)景的業(yè)務(wù)場(chǎng)景確實(shí)不多，回答的不是很好。問(wèn)...

From [Javadiscussion group] 2017-04-18 09:39:50 0  4  988

java - httpclient https SSLPeerUnverifiedException 異常

如下代碼,為什么還會(huì)發(fā)生這個(gè)異常javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated {代碼...} google 結(jié)果說(shuō)自定義TrustMan...

From [Javadiscussion group] 2017-04-17 16:50:57 0  0  988

java - 輸入輸出流 為什么兩次寫(xiě)操作時(shí)間間隔比較短的話 只要一次讀操作就能把兩次的數(shù)據(jù)讀取出來(lái),要sleep才能分開(kāi)

@Override {代碼...} // 接收端生成文件 {代碼...} // Log.i("MainActivity","---------stringbuffer = "+st...

From [Javadiscussion group] 2017-04-18 10:35:16 0  2  987

java - Maven項(xiàng)目怎么讀取resources配置文件？

項(xiàng)目目錄結(jié)構(gòu)： 代碼： {代碼...} 項(xiàng)目是用來(lái)生成mybatis相關(guān)文件的，但是一直報(bào)錯(cuò)：java.io.FileNotFoundException: generatorConfig.xml (系統(tǒng)找不到指定的文件。...

From [Javadiscussion group] 2017-04-18 09:46:24 0  3  987

java - 視屏轉(zhuǎn)換成流輸出給頁(yè)面

{代碼...} 小文件不會(huì)出問(wèn)題 大文件在os.write(data); 報(bào)錯(cuò)Connection reset by peer: socket write error 怎么解決 流著一塊不太熟悉 求代碼

From [Javadiscussion group] 2017-04-17 17:36:20 0  0  987

Is it not good to increase the length of the loop body when using a java for loop?

{Code...} For example, in the above code, if I do not enter the second level of for loop, I will perform an ad...

From [Javadiscussion group] 2017-06-28 09:23:52 0  7  986

java - mybatis build sqlsession 報(bào)錯(cuò)

1.根據(jù)xml創(chuàng)建sqlsession報(bào)錯(cuò)。2.錯(cuò)誤信息如下。 {代碼...} 3.根據(jù)網(wǎng)上說(shuō)的去掉xml中的注釋?zhuān)呀?jīng)試過(guò)了，沒(méi)有作用。4.xml如下 {代碼...}

From [Javadiscussion group] 2017-04-17 17:29:48 0  1  986

java - Comparable[] 排序的問(wèn)題

程序的結(jié)構(gòu)大致如下 {代碼...} 1.sort(...)方法需要的參數(shù)是一個(gè)Comparable數(shù)組，而arr是一個(gè)字符串?dāng)?shù)組，為什么可以直接傳入arr那？2.x[i]和a[i]表示同一個(gè)元素，為什么那？3.這樣寫(xiě)有什...

From [Javadiscussion group] 2017-04-17 16:15:05 0  2  985

并發(fā) - Java：Thread的holdsLock()這個(gè)方法該怎么用呢？

今天看博客看到這樣一句話： 在java.lang.Thread中有一個(gè)方法叫holdsLock()，它返回true如果當(dāng)且僅當(dāng)當(dāng)前線程擁有某個(gè)具體對(duì)象的鎖。 感覺(jué)很驚喜，因?yàn)閷?xiě)了不少線程但從來(lái)不知道有這個(gè)方法，于是想寫(xiě)個(gè)...

From [Javadiscussion group] 2017-04-17 15:43:38 0  2  985

Web Service 發(fā)布報(bào)錯(cuò)問(wèn)題？

 The SimpleService service, which is not valid, caused java.lang....

From [Javadiscussion group] 2016-10-25 11:17:15 0  0  985

java - How to separate the front-end and back-end to solve the problem of too much back-end data?

Recently, I am writing a project that separates the front and back ends. The back end returns json data. Sprin...

From [Javadiscussion group] 2017-05-17 09:57:41 0  5  984

java - IDEA tomcat連接數(shù)據(jù)庫(kù)出現(xiàn)問(wèn)題？

Javaweb新手,配置jndi后連接數(shù)據(jù)后總出現(xiàn)異常報(bào)錯(cuò)出現(xiàn)在 myConn = ds.getConnection(); 修改my.ini后還是會(huì)出現(xiàn)這種問(wèn)題 配置jndi的context.xml文件 {代碼...} ...

From [Javadiscussion group] 2017-04-18 10:53:49 0  1  984

java - Why can't I break out of this loop?

1. Problem description: Keep in an infinite loop, printing repeatedly until an error occurs 2. Related code {c...

From [Javadiscussion group] 2017-06-12 09:21:20 0  9  983

java - Problems in tomcat using redis to share sessions. Sessions cannot be shared.

Now that it is configured, the session can be stored in redis, but the session is not shared. JSESSIONID=85BA6...

From [Javadiscussion group] 2017-05-18 10:45:33 0  2  983